High-temperature stage of heating of a diatomic molecular gas under conditions of strong vibrational excitation
A diatomic molecular gas whose vibrational states are subject to intense pumping by an electron beam in the absence of thermal losses occurs in pulsed and high-speed-flow gas discharge devices. It is well known that in the initial stages the heating of the gas is mainly determined by vibrational-vibrational exchange (VV processes) in which highly excited levels are populated in the process of plateau formation. Banadaze et al determined the state of the gas by solving the balance equations of the level kinetics numerically. This approach is exact but demanding. Berdyshev et al suggested an analytical approach to the calculation, based largely on the numerical results obtained for moderate heating temperature (T {le} 500 K). Under these conditions vibrational-translational exchange (VT processes) play a minor role. The treatment of the heating and higher values of T is also of definite interest. From general considerations it follows that the intensity of VT processes increases as a function of T, and the vibrational and translational degrees of freedom acquire a single temperature in the gas. This transition has not been treated in detail in the literature. As will be shown in this paper the heating process is complicated and goes through several stages.
- OSTI ID:
- 105326
- Journal Information:
- Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 1 Vol. 19; ISSN PPHREM; ISSN 1063-780X
- Country of Publication:
- United States
- Language:
- English
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