Influence of electronically excited N₂ and O₂ on vibrational kinetics of these molecules in the lower thermosphere and mesosphere during auroral electron precipitation

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• 作者：A.S. Kirillov ; ^{kirillov@pgia.ru}
• 关键词：Molecular nitrogen and molecular oxygen ; Electronic and vibrational kinetics ; Lower ; Thermosphere and mesosphere ; Auroral precipitation
• 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
• 出版年：2012
• 期刊代码：41_13646826
• 类别：ear
• 出版时间：June, 2012
• 卷：81-82
• 期：Complete
• 页码：9-19
• 文件大小：1048 K

摘要

The rate coefficients of vibrational excitation of ground-state molecules N₂(X¹危_g⁺) and O₂(X³危_g^{鈭?/sup>) in processes of the quenching of electronically excited molecules N₂(A3危_u+, B3螤_g, W3螖_u, 袙鈥?sup>3}危_u^{鈭?/sup>, a鈥?sup>1}危_u^{鈭?/sup>, a1螤_g, w1螖_u) and O₂(a1螖_g, b1危_g+, c1危_u鈭?/sup>, A鈥?sup>3螖_u, A3危_u+) are calculated according to quantum-chemical approximations. Applying the calculated rate coefficients we have studied the role of inelastic intermolecular and intramolecular electron energy transfer processes in the production of vibrationally excited molecules at altitudes of the lower thermosphere and mesosphere during auroral electron precipitation. The study of vibrational populations (v鈥?2-30) of the X1危_g+ state of N₂ at the altitudes of the lower thermosphere and mesosphere during auroral electron precipitation has shown three principal excitation mechanisms: radiational transitions from the A3危_u+ and a1螤_g states for vibrational levels v鈥?gt;10, intramolecular electron energy transfer process in N₂(A3危_u+,v=0-5)+N₂ collisions for vibrational levels v鈥?25-30 and the excitation by auroral electrons. Calculations have shown that transitions from two singlet a1螖_g, b1危_g+, and three Herzberg c1危_u鈭?/sup>, A鈥?sup>3螖_u, A3危_u+ electronically excited states of molecular oxygen through radiational and collisional quenching are important in vibrational excitation of ground-state molecule O₂(X3危_g鈭?/sup>,v鈥?2-37).}