Collision-induced absorption in the a1Δg(v′=0) ← X3Σg- (v=0) transition in O2-CO2, O2-N2, and O2-H2O mixtures

被引:12
作者
Tipping, RH [1 ]
Brown, A
Ma, Q
Boulet, C
机构
[1] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA
[2] Columbia Univ, Dept Appl Phys, New York, NY 10025 USA
[3] NASA, Goddard Space Flight Ctr, Inst Space Studies, New York, NY 10025 USA
[4] Univ Paris 11, Photophys Mol Lab, CNRS, F-91405 Orsay, France
基金
美国国家航空航天局;
关键词
D O I
10.1006/jmsp.2001.8411
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
When O-2 is perturbed by collisions with other molecules, the weak spin-forbidden magnetic dipole transition a(1)Delta (g)- X(3)Sigma (-)(x) shows a broad continuum absorption underlying the sharp lines. This collision-induced enhancement absorption plays a role in the Earth's atmosphere and much experimental work has been carried out to measure the binary absorption coefficient with different perturber gases. Recent work on the upsilon'= 0 <-- v = 0 band in O-2-CO2 Mixtures yielded a value for the coefficient that was approximately three times that of earlier measurements on O-2-N-2, mixtures. In the present note, we calculate the absorption theoretically assuming that the long-range quadrupole-induced dipole mechanism is dominant. Using experimental polarizability matrix elements Of CO2 and ab initio results in the literature for the quadrupolar transition matrix element for O-2, we find good agreement for O-2-CO2 mixtures without any adjustable parameters. The agreement for O-2-N-2 is less good, and because of the much smaller polarizability of N-2 than Of CO2 We suggest that one has to include a short-range component in addition to the long-range one treated here. We also calculate the binary absorption coefficient for O-2-H2O, for which no experimental data are available, and we synthesize the corresponding spectrum for use in atmospheric modeling. (C) 2001 Academic Press.
引用
收藏
页码:88 / 91
页数:4
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