Rotational relaxation rates in CO-He mixtures |
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| Authors: | ANDREY E BELIKOV ALEXEY V STOROZHEV MIKHAIL L STREKALOV MARK A SMITH |
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| Institution: | 1. Institute of Thermophysics, I, Prospekt Lavrentjeva , 630090, Novosibirsk, Russia;2. Institute of Chemical Kinetics and Combustion, 3 , Instituteskaya Str., 630090, Novosibirsk, Russia;3. Department of Chemistry , University of Arizona , Tucson, AZ, 85721, USA |
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| Abstract: | The rotational level populations of CO molecules were measured in CO(<10%) + He free jets by electron beam fluorescence (in a stationary jet) and resonantly enhanced multiphoton ionization (in a pulsed jet). The measured evolution of the non-equilibrium rotational energy was used to derive the rotational relaxation cross-sections in the temperature range from 6 K to 140 K. To compare and analyse on a common basis all available experimental data (ours and others) on rotational relaxation of CO in He, the infinite order sudden approximation was explored. The following quantities were investigated: integral rotationally inelastic cross-sections, state-to-state rate coefficients, rotational relaxation times, line broadening coefficients, and non-equilibrium rotational energy distributions in a free jet. |
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