TEMPERATURE DEPENDENCE OF $N_{2}$-BROADENED HALFWIDTHS OF $H_{2}O$
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Date
1986
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Ohio State University
Abstract
The temperature dependence of $N_{2}$-broadened halfwidths of water was studied for rotational vibrational transitions of atmospheric importance. The halfwidths were calculated using cutoff free $theory^{1}$ with Anderson-Tsao-$Curnutte^{2}$ interruption functions and trajectories correct to first-order-in-$time^{3}$. The calculations were carried out for pure rotational transitions and for $\nu_{2}$ transitions. The temperture dependence was calculated assuming the exponential form $\gamma(T_{0})-\gamma(T)\left\{\frac{T}{T_{0}}\right\}^{n}$ The exponent n has been calculated for different rovibrtional transitions and the calculations have been performed over the temperature range 200 K to 1000 K to be applicable to both atmospheric studies as well as hot sources. The trends in $\pi$, such as vibrational dependence, J dependence, etc., are examined and recommended values are given.
Description
$^{1}$. D. Korff and R. P. Leavitt, Phys, Lett. A 53, 351(1975): D. Robert and J. Bonamy. J. Phys. (Paris) 40, 923(1979); R. P. Leavitt and D. Korpf, J. Chem. Phys. 74, 2180(1981). $^{2}$. P. W. Anderson, Phys. Rev. 76, 647-661(1949); 80, 511-513(1950); C. J. Tsao and B. Curnutte, J. Quant Spectresc. Radiat. Transfer 2, 41-91(1962). $^{3}$. R. R. Gamache and R. W. Davies, J. Mol. Spectrosc. 109, 283-299(1985). This work has been supported by the Aif Force Office of Scientific Research through AFGL task 2310G1. Address of Gamache: University of Lowell Center for Atmospheric Research. 450 Aiken Street, Lowell, MA 01854. Address of Rothman: Optics Division. Air Force Geophysics Laboratory, Hanscom AFB, MA 01731.
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