dablink This article is about nuclear physics. For electroncapture processes in chemistry, see Electroncapture ionization and Electroncapture dissociation . See also Beta decay File Elektroneneinfang 2 Phasen .png thumb ElectroncaptureElectroncapture is a process in which a proton rich nuclide ... state of the new nuclide. Electroncapture is the primary decay mode for isotope s with a relative ... by emitting a positron . Electroncapture also exists as a viable decay mode for radioactive ... to allow it, and thus electroncapture is the sole decay mode. For example, rubidium 83 37 protons, 46 neutrons will decay to krypton 83 36 protons, 47 neutrons solely by electroncapture the energy ... of electroncapture, one of the orbital electron s, usually from the K or L electron shell K electroncapture , also K capture , or L electroncapture , L capture , is captured by a proton ... to a neutron in electroncapture, the number of neutrons increases by 1, the number of protons decreases .... History The theory of electroncapture was first discussed by Gian Carlo Wick in a 1934 paper, and then developed by Hideki Yukawa and others. K electroncapture was first observed by Luis Alvarez ... ElectronCapture by Nuclei, Emilio Segr , chapter 3 in Discovering Alvarez selected works of Luis W ... Accessed on line October 7, 2009. ref ref Nuclear K ElectronCapture, Luis W. Alvarez, Physical ... capture in gallium 67 and other nuclides. ref name k ref ElectronCapture and Internal Conversion in Gallium ... reactions are written. Radioactive isotopes that decay by pure electroncapture can, in theory, be inhibited ... of this effect on electroncapture. Chemical bonds can also affect the rate of electroncapture to a small .... J. A 28, 375 377 2006 Change of the sup 7 sup Be electroncapture half life in metallic environments ... captureelectroncapture , while isotopes heavier than the stable ones decay by beta decay .CE.B2.E2.88.92 ... http www nds.iaea.org livechart The LIVEChart of Nuclides IAEA with filter on electroncapture ... more details
Electroncapture ionization is the ionization of a gas phase atom or molecule by attachment of an electron to create an ion of the form A sup sup . The reaction is math A e overset M to A math where the M over the arrow denotes that to conserve energy and momentum a third body is required the molecularity of the reaction is three . Electroncapture can be used in conjunction with chemical ionization . ref Citation doi 10.1021 ac50035a017 title Electroncapture negative ion chemical ionization mass spectrometry year 1978 author Donald F. Hunt Frank W. Crow journal Analytical Chemistry volume 50 issue 13 pages 1781 ref An electroncapture detector is used in some gas chromatography systems. ref GoldBookRef title electroncapture detector in gas chromatography file E01981 ref See also Electroncapture dissociation References Reflist analytical chem stub Category Ion source ... more details
Double electroncapture is a decay mode of atomic nucleus . For a nuclide A , Z with number of nucleon s A and atomic number Z , double electroncapture is only possible if the mass of the nuclide of A , Z 2 is lower. In this mode of decay, two of the orbital electron s are captured by two proton s in the nucleus ... krypton 78 2 SubatomicParticle link yes Electron &rarr Nuclide Link selenium 78 2 SubatomicParticle link yes Electron Neutrino In most cases this decay mode is masked by more probable modes single electroncapture etc. , but when all these modes are forbidden or strongly suppressed, double electroncapture becomes the main mode of decay. There exist 35 naturally occurring isotopes that can undergo double electroncapture. However, there are no confirmed observations of this process. One reason is that the probability of double electroncapture ... is enough to allow another mode of decay electroncapture with positron emission . It occurs simultaneously with double electroncapture, their branching ratio depending on nuclear properties .... Neutrinoless double electroncapture The above described process with capture of two electrons and emission of two neutrinos two neutrino double electroncapture is allowed by the Standard Model ... , another kind of the process can occur the so called neutrinoless double electroncapture. In this case ... &rarr Nuclide Link selenium 78 See also double beta decay beta decay electroncapture neutrino ..., and the atomic mass number A remains unchanged. By changing the number of protons, double electroncapture transforms the nuclide into a new chemical element element . Example Autogenerated using Phykiformulae ... are X ray s and Auger electron s that are emitted by the excited atomic shell. In the range of their energies 1 10 keV , the background is usually high. Thus, the experimental detection of double electroncapture is more difficult than that for double beta decay . If the mass difference between the mother ... more details
File Electroncapture detector.gif thumb right 200 px Schematic of an electroncapture detector for a gas chromatograph with a sup 63 sup Ni source. An electroncapture detector ECD is a device for detecting atoms and molecules in a gas through the attachment of electrons via electroncapture ionization . The device was invented in 1957 by James Lovelock Dr. James E. Lovelock ref cite journal title A sensitive detector for gas chromatography author J. E. Lovelock journal Journal of Chromatography A year 1958 volume 1 issue 1 pages 35 46 doi 10.1016 S0021 9673 00 93398 3 ref ref cite journal title The electroncapture detector author J.E. Lovelock journal Journal of Chromatography A year 1974 volume 99 issue 1 pages 3 12 doi 10.1016 S0021 9673 00 90840 9 ref and is used in Gas liquid chromatography gas chromatography to detect trace amounts of chemical compounds in a sample. ref cite journal title Selective detectors in gas chromatography author M. Krej i and M. Dressler journal Chromatographic ... journal title Electroncapture detection in gas chromatography author E. D. Pellizzari journal Journal ... ref Gas chromatograph detector The electroncapture detector is used for detecting electron absorbing ... by the Gas chromatography carrier gas , electron absorbing analyte molecules capture electrons ... is thus proportional to the degree of electroncapture. ECD detectors are particularly sensitive ... accessdate 2011 04 21 ref The detection limit for electroncapture detectors is 5 femtograms .... References Reflist Category Measuring instruments ElectronCapture Detector ECD Category Gas ... nl Electroncapture detector pl Detektor wychwytu elektron w ... . The ECD uses a radioactive beta particle electron emitter in conjunction with a so called makeup gas flowing through the detector chamber. The electron emitter typically consists of a metal ... to remove an electron from a nitrogen molecule. The electrons emitted from the electron emitter collide ... more details
Orphan date January 2011 Electroncapture mass spectrometry EC MS is a type of mass spectrometry that uses electroncapture ionization ECI to form negative ion s from chemical compounds with positive electron affinity electron affinities . The approach is particularly effective for electrophile s. In contrast to electron ionization , EC MS uses low energy electrons in a gas discharge . The technique can be used with gas chromatography mass spectrometry . ref name pmid15180565 cite journal author Leis HJ, Fauler G, Rechberger GN, Windischhofer W title Electroncapture mass spectrometry a powerful tool in biomedical trace level analysis journal Curr. Med. Chem. volume 11 issue 12 pages 1585 94 year 2004 month June pmid 15180565 doi url http www.bentham direct.org pages content.php?CMC 2004 00000011 00000012 0005C.SGM ref Mechanism The attachment of a low energy electron can give rise to two possible reactions for the compound, as shown below. Either the compound attaches an electron to form a Radical chemistry radical anion , math AB e to AB bullet math , or the compound fragments, resulting in electroncapture dissociation ECD . ref cite journal last Giese first RW title Electroncapture mass spectrometry recent advances journal Journal of Chromatography volume 892 issue 1 2 pages 329 346 publisher location year 2000 url doi 10.1016 S0021 9673 00 00364 2 pmid 11045497 accessdate ref ECD forms an anion fragment and a radical fragment math AB e to A B bullet math . Fragmentation in ECI has been studied by tandem mass spectrometry . ref name pmid10962492 cite journal author Wei J, Liu S, Fedoreyev SA, Voinov VG title A study of resonance electroncapture ionization on a quadrupole tandem mass spectrometer journal Rapid Commun. Mass Spectrom. volume 14 issue 18 pages 1689 94 year 2000 pmid 10962492 doi 10.1002 1097 0231 20000930 14 18 1689 AID RCM75 3.0.CO 2 G ref See also Electroncapture detector References reflist Category Ion source chemistry stub ... more details
Electroncapture dissociation ECD is a method of Fragmentation mass spectrometry fragmenting gas phase ... NL, McLafferty FW title Electroncapture dissociation of multiply charged protein cations. A nonergodic ... ref ref name McLafferty2001 Cite journal last McLafferty first F. year 2001 title Electroncapture ... s lab at Cornell University . Principles Electroncapture dissociation typically involves a multiply protonated molecule M interacting with a free electron to form an odd electron ion math M nH ... JE title Structural characterization of the GM1 ganglioside by infrared multiphoton dissociation, electroncapture dissociation, and electron detachment dissociation electrospray ionization FT ICR MS ... cite journal author Cooper HJ, H kansson K, Marshall AG title The role of electroncapture dissociation ... Toward a general mechanism of electroncapture dissociation journal J. Am. Soc. Mass Spectrom. volume ... initiated by the electron may be responsible for the action of ECD. ref cite journal author Leymarie N, Costello CE, OConnor PB title ElectronCapture Dissociation Initiates a Free Radical Reaction Cascade ... ref ref name pmid16794768 cite journal author Bakhtiar R, Guan Z title Electroncapture dissociation ... also Electroncapture ionization electroncapture mass spectrometry RRKM theory References Reflist ... MS MS fragmentation methods such as electron detachment dissociation electron detachment dissociation ... M, Skurski P, Simons J title Backbone and side chain cleavages in electron detachment dissociation ... TN, Linhardt RJ, Amster IJ title EVALUATION OF THE EXPERIMENTAL PARAMETERS WHICH CONTROL ELECTRON ... RA title C alpha C backbone fragmentation dominates in electron detachment dissociation of gas phase ... on the electron detachment dissociation and infrared multiphoton dissociation of glycosaminoglycan oligosaccharides ... author Savitski MM, Kjeldsen F, Nielsen ML, Zubarev RA title Complementary sequence preferences of electroncapture dissociation and vibrational excitation in fragmentation of polypeptide polycations ... more details
The Capture Guardians of Ga Hoole The Capture Animorphs Animorphs Book 6 The Capture , a novel by K.A. Applegate The Capture film The Capture film , a 1950 film starring Lew Ayres and Teresa Wright The Capture , a humorous slideshow written by Robert Asprin and illustrated by Phil Foglio, nominated for the 1976 Hugo Award for Best Dramatic Presentation Guardians of Ga Hoole The Capture Guardians of Ga Hoole Book 1 The Capture , a novel by Kathryn Lasky See also Capture disambiguation disambig Guardians of Ga Hoole The Capture by Kathryn Lasky ... more details
into single line entries. Infobox Particle name Electron image File Crookes tube in use lateral view standing cross prPNr 11.jpg 280px alt A glass tube containing a glowing green electron beam caption ... Rays A History of J J Thomson s Electron url http books.google.com ?id xUzaWGocMdMC&printsec ... Warwick first2 A. year 2001 title Histories of the Electron The Birth of Microphysics url http ... 44 page 293 ref symbol SubatomicParticle Electron , SubatomicParticle beta mass val 9.10938291 ... electric charge val 1 el e ref group note The electron s charge is the negative of elementary ... Bohr magneton sub B sub ref name 2010 CODATA spin frac 1 2 The electron symbol SubatomicParticle Electron is a subatomic particle with a negative elementary charge elementary electric charge . It has ... . ref name prl50 An electron has a rest mass mass that is approximately Proton to electron mass ... spin of the electron is a half integer value in units of reduced Planck constant , which means that it is a fermion . The antiparticle of the electron is called the positron it is identical to the electron .... When an electron positron annihilation electron collides with a positron , both particles may be totally ... mass. Since an electron is a fermion, no two electrons can occupy the same quantum state ... electron was introduced for this charge in 1894 by Irish physicist George Johnstone Stoney . The electron .... An electron in motion relative to an observer generates a magnetic field , and will be deflected by external magnetic fields. When an electron is accelerated, it can absorb or radiate energy in the form ... Coulomb s law Coulomb force between an electron and a proton causes electrons to be Binding energy ... individual electrons as well as Plasma physics electron plasma , whereas dedicated telescope s can detect electron plasma in outer space. Electrons have many applications, including Electron beam welding welding , cathode ray tube s, electron microscope s, radiation therapy , free electron laser lasers ... more details
Wiktionary Capture may refer to Capture chess , to remove the opponent s piece from the board by taking it with one s own piece Capture politics , situations in which a government agency created to act in the public interest instead acts in favor of other interests Capture rivers , a geomorphological phenomenon occurring when a stream or river is diverted from its own bed FM capture , a phenomenon in which only the stronger of two signals near the same FM frequency will be demodulated Motion capture , the process of recording movement and translating that movement onto a digital model Schematic capture , a step in electronic design automation at which the electronic schematic is created by a designer Capture CIS , a software tool used for circuit schematic capture Screen capture disambiguation , an image taken by the computer to record the visible items Video capture , the process of converting an analog video signal to digital form Capture fishery , a wild fishery in which the aquatic life is not controlled and needs to be captured or fished Rule of capture , common law that determines ownership of captured natural resources including groundwater, oil, gas and game animals disambig es Captura fr Capture ko ru ... more details
Electron wake is the disturbance left after a high energy charged particle passes through condensed matter or plasma. Ions passing through can introduce periodic oscillations in the crystal lattice or plasma wave with the characteristic frequency of the crystal or plasma frequency . Interactions of the field created by these oscillations with the charged particle field alternate from constructive interference to destructive interference , producing alternating waves of electric field and displacement. The frequency of the wake field is determined by the nature of the penetrated matter, and the period of the wake field is directly proportional to the speed of the incoming charged particle. The amplitude of the first wake wave is the most important, as it produces a braking force on the charged particle, eventually slowing it down. Wake fields also can capture and guide light ions or positrons in the direction perpendicular to the wake. The larger the speed of the original charged particle, the larger the angle between the initial particle s velocity and the captured ion s velocity. References No footnotes date July 2009 http encyclopedia2.thefreedictionary.com Electron wake Encyclopedia article on the electron wake http ieeexplore.ieee.org iel5 4439904 4439905 04440675.pdf On the possibility of accelerating positron on an electron wake at saber See also Coulomb explosion Charged particle beam Linear particle accelerator Wake fields Wake fields Plasma acceleration Bremsstrahlung List of plasma physics articles DEFAULTSORT Electron Wake Category Atomic physics Category Plasma physics Category Scattering Category Accelerator physics physics stub ... more details
Wiktionarypar electron An electron is a subatomic particle. Electron may also refer to Electron bird , a genus of birds Electron vehicle , an electric urban vehicle concept by AMC Electron computer hacker , a member of an Australian hacking group Acorn Electron , an 8 bit computer by Acorn Computers Ltd Visa Electron , a brand of credit or debit cards Electron engine , a video game engine by Obsidian Entertainment L 188W Electron , an Argentine Navy version of the Lockheed L 188 Electra Electron comic book character , character by Apokalupsis Webcomics Electron or elementary charge e See also Elektron alloy , a range of magnesium alloys Electro disambiguation Elektron disambiguation Electrum disambig ast Electr n dixebra fr Electron la Electron discretiva nl Electron pl Electron uk ... more details
value and the reaction is called an Exothermic reaction exothermic process . Electroncapture ... on electron emission, see Figure 3 in Marchywka Effect . See also Electroncapture mass spectrometry ...File Electron Affinity in Band Diagram.png thumb Electron affinity E sub EA sub in a band diagram for solids .... The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is added to a neutral atom or molecule to form a negative ion. ref name Compendiumof GoldBookRef title Electron affinity file E01977 ref X e sup sup X sup sup This property is measured ... levels would be changed by contact with other atoms or molecules. A list of the electron affinities ... of the electron affinity and ionization potential . ref Robert S.Mulliken, Journal of Chemical Physics ... electron affinity include electronic chemical potential and chemical hardness . Another example, a molecule or atom that has a more positive value of electron affinity than another is often called an electron acceptor and the less positive an electron donor . Together they may undergo charge transfer reactions. In solids, the electron affinity is the energy difference between the vacuum energy ... L th, Springer, Berlin, 1999, 5.th edition ref To use electron affinities properly, it is essential ... sign implies a reversal of direction, and energy is required to attach an electron. In this case, the electroncapture is an endothermic process and the relationship, E sub ea sub E attach is still valid. Negative values typically arise for the capture of a second electron, but also for the nitrogen atom. br br The usual expression for calculating E sub ea sub when an electron is attached ..., electron affinity can also be defined as the amount of energy required to detach an electron ... Electron affinities of the elements Main Electron affinity data page Although E sub ea sub varies greatly ... electron. The electron affinities of the noble gases have not been conclusively measured, so ... more details
Unreferenced stub auto yes date December 2009 Electron excitation is the movement of an electron to a higher energy state . This can either be done by photoexcitation PE , where the original electron absorbs the photon and gains all the photon s energy or by electrical Excited state excitation EE , where the original electron absorbs the energy of another, energetic electron. Within a semiconductor crystal lattice, thermal excitation is a process where lattice vibrations provide enough energy to move electrons to a higher energy band . When an excited electron falls back to a lower energy state again, it is called electron relaxation . This can be done by radiation of a photon or giving the energy to a third spectator particle as well. DEFAULTSORT Electron Excitation Category Electron Physics stub ja ... more details
An electron avalanche is a process in which a number of free electron s in a Transmission medium medium usually a gas are subjected to strong acceleration by an electric field , ion izing the medium s atoms by collision called impact ionization , thereby forming new electrons to undergo the same process in successive cycles. This uncontrolled positive feedback loop leads to a type of chain reaction . Electron avalanches are essential to the dielectric breakdown process within gases. The process can culminate in corona discharge s, streamer s, leader spark leader s, or in a electric spark spark or continuous electric arc arc that completely bridges the gap. The process extends to huge sparks streamers in lightning discharges propagate by formation of electron avalanches created in the high potential gradient ahead of the streamers advancing tips. Once begun, avalanches are often intensified by the creation of photoelectron s as a result of ultraviolet radiation emitted by the excited medium s atoms in the aft tip region. The process can also be used to detect ionizing radiation that initiates the process, in as much as the passage of a single particles can amplified to large discharges. This is the mechanism of a Geiger counter and also the visualization possible with a spark chamber ... polarity, whereas the electron will be acceleration accelerated in the opposite direction. Because of the huge ... chain reaction or an electron avalanche additional electrons recently separated from their positive ... generated by just a single initial electron. However, free electrons are easily captured ... at a rate greater than they are being lost to capture, their number rapidly multiplies, a process ... free electron at position X sub 1 sub will result in M free electrons at position X sub 2 sub . Substituting ... gas molecule creating another accelerable electron. What differs is the source of this electron. When one or more electron avalanches occur between two electrodes of sufficient size, complete avalanche ... more details
Unreferenced stub auto yes date December 2009 Electron deficiency occurs when a compound has too few valence electron s for the connections between atoms to be described as covalent bond s. Electron deficient bonds are often better described as 3 center 2 electron bond s. Examples of compounds that are electron deficient are the borane s. The term electron deficient is also used in a more general way in organic chemistry , to indicate a pi bonding pi system such as an alkene or arene that has Polar effect electron withdrawing groups attached, as found in nitrobenzene or acrylonitrile . Instead of showing the nucleated character common with simple C C bonds, electron deficient pi systems may be electrophile electrophilic and susceptible to nucleophilic attack, as is seen in the Michael addition or in nucleophilic aromatic substitution . As the most extreme form of highly localize electron deficiency one can consider the metallic bond . DEFAULTSORT Electron Deficiency Category Chemical bonding Chem stub ar de Elektronenmangelbindung nl Elektronendefici ntie pt Defici ncia de el trons zh ... more details
Electron scattering is the process whereby an electron is deflected from its original trajectory . As they are charged particle s, they are subject to electromagnetic force s. Phenomena Electrons can be scattering scattered by other charged particles through the Coulomb s law electrostatic Coulomb forces . Furthermore, if a magnetic field is present, a traveling electron will be deflected by the Lorentz force . An extremely accurate description of all electron scattering, including quantum and relativistic aspects, is given by the theory of quantum electrodynamics . Types Common electron scattering processes include Compton scattering , in which an electron absorbs a photon and reemits it, changing the energy and momentum of both M ller scattering , in which two electrons scatter off of one another Bhabha scattering , in which an electron and a positron scatter Bremsstrahlung , in which an electron most commonly, but also any other particle passes by a heavy charged object like a nucleus , changes energy and direction, and emits a photon Deep inelastic scattering , in which a high energy electron interacts with a nucleus and breaks it up Synchrotron emission , in which an electron interacts with an external magnetic field, changes direction, and emits a photon. physics stub DEFAULTSORT Electron Scattering Category Electron Category Scattering de Elektronenstreuung it Scattering di elettroni ... more details
An electron orbital may refer to An atomic orbital , describing the behaviour of an electron in an atom A molecular orbital , describing the behaviour of an electron in a molecule See also Electron configuration , the arrangement of electrons in structures such as atoms or molecules Orbital hybridization , a combining of atomic orbitals to form an equal number of hybrid orbitals when forming certain molecule s disambig ja vi Orbital ... more details
An electron donor is a chemical entity that donates electron s to another compound. It is a reducing agent that, by virtue of its donating electrons, is itself oxidize d in the process. Typical reducing agents undergo permanent chemical alteration through covalent or ionic reaction chemistry. This results in the complete and irreversible transfer of one or more electrons. In many chemical circumstances, however, the transfer of electronic charge to an electron acceptor may be only fractional, meaning an electron is not completely transferred, but results in an electron resonance between the donor ... retain their chemical identities. The electron donating power of a donor molecule is measured by its ionization potential which is the energy required to remove an electron from the highest occupied molecular orbital . The overall energy balance E , i.e., energy gained or lost, in an electron donor acceptor transfer is determined by the difference between the acceptor s electron affinity A and the ionization potential I math Delta E A I , math In chemistry , the class of electron donors that donate not just one, but a set of two paired electrons that form a covalent bond with an electron ... forces for electron donor and acceptor behavior in chemistry is based on the concepts of electropositivity for donors and electronegativity for acceptors of atomic or molecular entities. Electron donors in biology In biology , electron donors release an electron during cellular respiration , resulting in the release of energy . Microorganisms , such as bacteria , obtain energy in the electron ... use. The final result is the electron is donated to an electron acceptor. During this process electron transport chain the electron donor is oxidized and the electron acceptor is reduced. Petroleum hydrocarbons ... compounds are all compounds that can act as electron donors. These reactions are of interest not only ... http toxics.usgs.gov definitions electron donor.html Electron donor definition at United States ... more details
An electron acceptor is a chemical entity that accepts electron s transferred to it from another compound. It is an oxidizing agent that, by virtue of its accepting electrons, is itself redox reduced in the process. ref http toxics.usgs.gov definitions electron acceptor.html ref Typical oxidizing agents undergo permanent chemical alteration through covalent or ionic reaction chemistry, resulting in the complete and irreversible transfer of one or more electrons. In many chemical circumstances, however, the transfer of electronic charge from an electron donor may be only fractional, meaning an electron is not completely transferred, but results in an electron resonance between the donor and acceptor ... their chemical identities. The electron accepting power of an acceptor molecule is measured by its electron affinity which is the energy released when filling the lowest unoccupied molecular orbital LUMO . The overall energy balance E , i.e., energy gained or lost, in an electron donor acceptor transfer is determined by the difference between the acceptor s electron affinity A and the ionization potential I of the electron donor math Delta E A I , math . In chemistry , a class of electron acceptors that acquire not just one, but a set of two paired electrons that form a covalent bond with an electron ... The driving forces for electron donor and acceptor behavior in chemistry is based on the concepts .... Examples Examples of electron acceptors include oxygen , nitrate , iron III , manganese IV , sulfate .... Fact date March 2008 In biology , a terminal electron acceptor is a compound that receives or accepts an electron during cellular respiration or photosynthesis . All organisms obtain energy by transferring electrons from an electron donor to an electron acceptor. During this process electron transport chain the electron acceptor is reduced and the electron donor is oxidized . See also redox ... definitions electron acceptor.html Electron acceptor definition at United States Geological ... more details
Electron optics is a mathematical framework for the calculation of particle paths along given electrostatic ..., deflection, chromatic effects . Electron optics calculations are, besides other uses, needed for electron ... approximation , this can be done using ray transfer matrix analysis . Electron properties main Electron Electrons are charged particles point charge s with rest mass . The electron also has an associated spin physics spin of 1 2. While in motion an electron possesses kinetic energy , regardless of any ... into a screened field free region, which initially imparts the energy required to accelerate the electron. Given sufficient voltage, the electron can be accelerated sufficiently fast to exhibit measurable ... associated wave properties such as wavelength, phase and amplitude. With respect to electron optics, the nature of the electron as a charged particle causes electrons to interact with imposed electron ... of electron optical theory. Field interactions Particle interpretation Magnetic fields interact with an electron in a manner that alters velocity independently of kinetic energy velocity magnitude . Electrons move according to the cross product of the magnetic field and the electron propagation ... radius dependent upon electron velocity and magnetic field strength field strength according ... r is the orbit radius, m is the mass of an electron, v is the electron velocity, e is the charge on the electron ... electrostatic field, an electron will deflect towards the positive gradient of the field ... , a full analysis of electron paths can be obtained by solving Maxwell s equation however in many ... to not only the nucleus, but also the matter s electron charge cloud. Therefore electrons require vacuum to propagate any reasonable distance, such as would be desirable in electron optic ... 90685 3 ref See also Charged particle beam Strong focusing Electron beam technology Electron microscope ... eo.html Air Force Research Laboratory Electron Optics Program refend DEFAULTSORT Electron Optics ... more details
distinguish Visa Debit Refimprove date October 2010 globalize date January 2011 Image Visa Electron card.jpg thumb 250px Norway Norwegian old design Visa Electron card Image Visa Electron.PNG thumb 250px Sweden Swedish Visa Electron card featuring the new Electron logo Visa Electron is a debit card available ... card to the Visa Debit card. The difference between Visa Electron and Visa Debit is that payments with Visa Electron require that all the funds be available at the time of transfer, i.e., Visa Electron ... and aircraft do not support Visa Electron because their systems cannot check for the availability of funds ..., one bank may issue a Visa Electron debit card , while another may issue a credit card . It is most ... countries. This is because Visa Electron cards are also linked to the Visa PLUS interbank network ... s accounts. ref name bbc2 http news.bbc.co.uk 1 hi programmes moneybox 3717331.stm Electron users blocked online BBC News ref As of 2009, most UK banks have migrated away from Visa Electron of the major banks, only HBOS still issues the card ref name Halifax Visa Electron http www.halifax.co.uk bankaccounts other bank accounts easycash Halifax EasyCash Electron Card ref , with others including ... 1 hi business 8384034.stm Visa Electron cards to be phased out BBC News ref Lloyds TSB, Barclays ... cards Visa Electron has become popular with younger people and students. As each transaction requires funds to be checked accounts cannot be overdrawn. Therefore banks will issue a Visa Electron card ... Electron to customers who should not be allowed to go overdrawn, banks will issue what is ostensibly ... as Electron. This can cause these cards to be declined where an actual Visa Debit card would be accepted, for example at petrol pumps or train stations. As Visa Electron cards do not have Embossing ... which surcharge credit and debit card payments do not usually surcharge Visa Electron payments ... cards ref name bbc1 , but neither affords the card a special status any more. In China , Visa Electron ... more details
Electron holography is holography with electron waves. Dennis Gabor invented holography in 1948 ref D. Gabor, A new microscopic principle, Nature 4098, 777 1948 . ref when he tried to improve resolution in electron microscope. The first attempts to perform holography with electron waves were made by Haine and Muley in 1952 ref M. E. Haine, T. Mulvey, The formation of the diffraction image with electrons ... invented biprism for electrons and recording of electron holograms in off axis scheme became possible. Cowley has described 20 configurations for electron holography ref J. M. Cowley, Twenty forms of electron ... i.e. energy spread of electron beam are required to perform holographic measurements. High energy electron holography in off axis scheme Electron holography with high energy electrons 80 200keV can be realized in a transmission electron microscope TEM in off axis scheme. Electron beam is split into two parts by very thin positively charged wire. Positive voltage deflects the electron waves ... in TEM.jpg thumb An illustration to off axis electron holography in transmission electron microscope ... ref M. Lehmann, H. Lichte, Tutorial on off axis electron holography, Microsc. Microanal ... of the object function are reconstructed. Electron holography in in line scheme Original holographic ... electron beam, part of the wave is scattered by the object object wave and it interferes with the unscattered ... by the size of the electron source. Holography with low energy electrons 50 1000eV can be realized ..., Phys. Rev. Lett. 65 10 , 1204 1206 1990 . ref . File InlineHolography.jpg thumb Inline electron ... and sample must be properly grounded and shielded from outside noise. Applications Electron holography ref H. Lichte, Electron holography approaching atomic resolution, Ultramicroscopy 20, 293 1986 . ref ref A. Tonomura, Applications of electron holography, Rev. Mod. Phys. 59, 639 1987 . ref is commonly ... et al., Micros. Res. and Tech. 64, 390 2004 . ref . The principle of electron holography can also ... more details
Electron transfer ET is the process by which an electron moves from an atom or a chemical species e.g. ..., and detoxification. Additionally, the process of energy transfer can be formalized as a two electron .... ISBN 0 12 352651 5. ref but there are now many examples of ET in organic chemistry . Classes of electron transfer There are several classes of electron transfer, defined by the state of the two redox centers and their connectivity Inner sphere electron transfer main Inner sphere electron transfer ..., in which case the electron transfer event is termed intramolecular electron transfer. More ... following the ET event. In such cases, the electron transfer is termed intermolecular electron ... partners. Outer sphere electron transfer main Outer sphere electron transfer In outer sphere ET reactions ..., the electron hops through space from the reducing center to the acceptor. Outer sphere electron transfer ... describes the Degenerate energy level degenerate reaction between permanganate and its one electron ... Mn O sub 4 sub sup sup In general, if electron transfer is faster than ligand substitution, the reaction will follow the outer sphere electron transfer. Often occurs when one both reactants are inert ... work w sub r sub 2. changing bond lengths, reorganize solvent activated complex 3. Electron transfer ... work w sub p sub Heterogeneous electron transfer main Heterogeneous electron transfer In heterogeneous electron transfer, an electron moves between a chemical species and a solid state electrode . Theories addressing heterogeneous electron transfer have applications in electrochemistry and the design ... to address outer sphere electron transfer and was based on a transition state theory approach. The Marcus theory of electron transfer was then extended to include inner sphere electron transfer ... most discussions of electron transfer ever since. Both theories are, however, semiclassical in nature ... of vibronic coupling on electron transfer. In particular the PKS theory of electron transfer ... more details
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