Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt........34s&link_type=abstract
Ph.D. Thesis Stanford Univ., CA.
Physics
Electron Energy, Hydrogen Plasma, Nonequilibrium Radiation, Radiative Transfer, Atomic Collisions, Ionizing Radiation, Kinetic Equations, Thermodynamic Equilibrium
Scientific paper
The effects of relaxing the a priori assumption of local thermodynamic equilibrium for the free electrons in a hydrogen plasma were studied. A kinetic equation describing the balance between elastic and inelastic collisions is presented and accurate approximate solutions for the distribution function are obtained. These show that the tail of the distribution is susceptible to distortion for ionization fractions. Expressions for the collision rates are obtained which explicitly display their dependence on the atomic level populations. These expressions are combined with the statistical equilibrium and radiative transfer equations and the following problems are considered: (1) the thermal ionization equilibrium of an optically thin hydrogen gas; (2) the formation of a spectral line by a gas of two-level atoms; and the transfer of radiation through a gas of four-level hydrogen atoms. The effects of atom-atom collisions are considered in the first and third problems.
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