THEORETICAL PREDICTION OF FAR WING INFRARED LINESHAPES
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Date
1988
Authors
Brown, R. C.
Wormhoudt, J.
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Far wing absorption is important in determining long path atmospheric absorption between strong adsorption bands. Development of a detailed dynamical theory of wing lineshapes for atmospheric molecules is a challenging task. A fully quantum mechanical, time dependent, perturbative $theory^{1}$ has been used to evaluate far wing absorption for the 404-515 self-broadened H2O rotational line. The predicted absorption coefficient increases with temperature, in contrast to experimental observations of a strong negative temperature dependence. Replacement of an Anderson-like ad hoc cutoff by a formal resummation of the perturbation series yielded no improvement. We conclude that perturbative methods using multipole expansions are not adequate for this system. Preliminary calculations for an Ar-HC1 test case using a non-perturbative technique, the Recursive Residue Generation Method,2 will be presented.
Description
$^{1}$ R.W. Davies, R.H. Tipping and S.A. Clough, Phys. Rev. A 26, 3378 (1982). $^{2}$ A. Nauts and R.E. Wyatt, Phys. Rev. A 30, 872 (1984). Work supported by AFOSR under Contract F19628-85-C-0183
Author Institution: Center for Chemical and Environmental Physics, Aerodyne Research
Author Institution: Center for Chemical and Environmental Physics, Aerodyne Research