Electron volt, unit

Values of the X-ray X-absorption edges for the fir.st transition series elements and for some other elements important in catalysis are shown in Table I, both in wavelength (angstrom) units and energy (electron volt) units. The values represent the mid-point of the first steep rise in the X-absorption spectrum of the element, generally in the form of the metal. All are from the publications of Cauchois IS). 

Electron volt—unit for measuring energy. An electron volt is the energy gained or lost by an electron as it passes through a potential difference of one volt. 

Electron volt—Unit of energy equivalent to the amount of energy gained by an electron when it passes from a point of low potential to a point 1 V higher in potential. 

The electron volt unit of energy and the wave number quantity were encountered in this brief introduction to spectroscopy. A survey of units used in spectroscopy was presented as... 

Note that we are interested in nj, the atomic quantum number of the level to which the electron jumps in a spectroscopic excitation. Use the results of this data treatment to obtain a value of the Rydberg constant R. Compare the value you obtain with an accepted value. Quote the source of the accepted value you use for comparison in your report. What are the units of R A conversion factor may be necessary to obtain unit consistency. Express your value for the ionization energy of H in units of hartrees (h), electron volts (eV), and kJ mol . We will need it later. 

Refer to Computer Project 7-2. Calculate p in units of electron volts using Wheland s extension of Huckel molecular orbital theory. 

Plot the calculated first IPs as a function of the atomic number Z for the elements from H to Ne in the atomic table. The plot has a characteristic shape that should be familiar from earlier courses. These plots are frequently given in the experimental units of electron volts (eV hartrees x 27.21 = eV) or kilojoules per mole (kJ mol hartrees x 2625 = kJmol ). Write a paragraph or two in your project report explaining why the graph of IP vs. Z appears as it does. 

In photoelectron and related spectroscopies, ionization energies are measured. For many years such energies have been quoted in electron volts, where 1 eV = 1.602 176 462 x 10 J, and I have continued to use this unit. 

Eig. 1. Representation of the band stmcture of GaAs, a prototypical direct band gap semiconductor. Electron energy, E, is usually measured in electron volts relative to the valence, band maximum which is used as the 2ero reference. Crystal momentum, is in the first BriUouin 2one in units of 27r/a... 

The basic unit of energy used in accelerator physics is the electron volt (eV), which is the energy acquired by an electron when accelerated through a potential difference of one volt. An electron volt is a very small unit compared to an energy unit such as a food calorie (kilocalorie). A kilocalorie is about 26 billion trillion times as large as an eV. Common multiples of eV arc McV (niillion cV), GcV (billion cV), and TcV (trillion eV). 

If we were to forget that the flow of current is due to a random motion which was already present before the field was applied—if we were to disregard the random motion entirely and assume that each and every electron, in the uniform field X, moves with the same steady velocity, the distance traveled by each electron in unit time would be the distance v used in the construction of Fig. 16 this is the value which would lead to a current density j under these assumptions, since all electrons initially within a distance v of the plane AB on one side would cross AB in unit time, and no others would cross. Further, in a field of unit intensity, the uniform velocity ascribed to every electron would be the u of (34) this quantity is known as the mobility of the charged particle. (If the mobility is given in centimeters per second, the value will depend on whether electrostatic units or volts per centimeter are used for expressing the field strength.)... 

Returning now to silver chloride, let us apply these ideas to its saturated aqueous solution at 25°. From the value given in Table 42, we see that in solid AgCl the entropy per ion pair is almost exactly 1 milli-electron-volt per degree, which is equivalent to 23.0 cal/deg/mole. It makes no difference whether we express the entropies per ion pair in electron-volts per degree or in the equivalent calories per degree per mole. In the electrochemical literature the calorie per degree per mole is used and is called one entropy unit. (This is abbreviated e.u.) ... 

It should be observed that the subscript exact here refers to the lowest eigenvalue of the unrelativistic Hamiltonian the energy is here expressed in the unit Aci 00(l+m/Mz) 1 and Z is the atomic number. If the HE energies are taken from Green et al.,8 we get the correlation energies listed in the first column of Table I expressed in electron volts. The slow variation of this quantity is noticeable and may only partly be understood by means of perturbation theory. 

Work functions refer traditionally not to one mole of electrons (with the charge -F) but to one electron with the charge -Q°, and usually are stated in electrical units of electron volts (1 eV = 1.62 X 10 J). In equations of the type of (2.32), therefore, the value of also refers to one electron. 

Electronic energies are often expressed in the unit electron volt (eV). An electron volt is defined as the kinetic energy of an electron accelerated through a potential difference of 1 volt. Thus, we have... 

Electron Volt—A unit of energy equivalent to the energy gained by an electron in passing through a potential difference of one volt. Larger multiple units of the electron volt are frequently used keV for thousand or kilo electron volts MeV for million or mega electron volts (eV). 1 eV= 1.6x1 O 12 erg. 

Electron-volt (eV) Energy acquired by any charged particle that carries unit electronic charge when it falls through a potential difference of 1 volt. One eV = 1.602 x ICE19 joule. 

Electron Volt (eV) A non-SI unit of energy defined as the energy acquired by a particle containing one unit of charge through a potential difference of one volt,... 

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