PREDICTED ELECTRON-TRANSPORT COEFFICIENTS AT HIGH E-N-VALUES .1. HYDROGEN

被引:38
作者
BRUNET, H
VINCENT, P
机构
[1] Laboratoires de Marcoussis, Centre de Recherches de la C.G.E., Division of Lasers
关键词
D O I
10.1063/1.326580
中图分类号
O59 [应用物理学];
学科分类号
摘要
Transport coefficients of electrons in hydrogen are calculated over the range 10-16≤E/N≤2.9×10-15 V cm2 by solving the Boltzmann equation using a two-term spherical-harmonic expansion which takes into account the effect of the source of new electrons produced by ionization. Recently reported electron cross-section data, both experimental and theoretical, have been used in the calculation. It is shown that the release of new electrons in ionizing collisions has a noticeable effect on the electron distribution function starting from E/N≃1.2×10-15 V cm2. The predicted values of the first Townsend ionization coefficient are in excellent agreement with experimental results over the entire range of E/N values considered without using unrealistically large momentum-transfer cross sections at high electron energies. The calculated values for the drift velocity vd are in good agreement with the measured values. For the characteristic energy DT/μ, the agreement is good up to E/N=2×10-15 V cm2, while for higher E/N it becomes less satisfactory. The electron excitation rates for the vibration, the excitation of the B 1Σ+u and C 1Πu electronic states, and the rate of H-atom production are presented as a function of E/N. Results are also given for the fraction of the input power that is transfered to the various inelastic processes.
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页码:4700 / 4707
页数:8
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