|Author||Beigman, I. ♦ Vainshtein, L.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ ATOMIC MODELS ♦ ATOMS ♦ CROSS SECTIONS ♦ ELECTRONS ♦ ENERGY LEVELS ♦ EQUATIONS ♦ EXCITATION ♦ INTERACTIONS ♦ IONIZATION ♦ PROTONS ♦ TRANSIENTS|
|Abstract||In view of the complexity of the needed measurements and calculations, effective excitation and ionization cross sections must often be determined by using empirical formulas; these relatively simple expressions are useful for estimating plasma processes. The formulas are expected to various authors for use in the case of the collision of atoms with electrons are reviewed. The formulas are expected to give the order magnitude of the cross section, i.e., its maximum and its dependence on the energy of the external electron. The parameters used in the formulas include the ionization and excitation threshold energy and the energy of the external electron, together with a proportionality factor referring to the number of equivalent electrons in the shell in which the process takes place. Quite often, instead of the cross section, the average Maxwellian transition frequency must be calculated. In the case of collisions with heavy particles, such as protons, the adiabatic effect must be taken into account. (TTT)|
|Learning Resource Type||Article|
|Journal||Izvestiya Akademii Nauk, Seriya Fizicheskaya|
|Organization||Lebedev Inst. of Physics, Moscow|
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