l -Resonance Intensity Effects and Pressure Broadening of N 2 O at 17 mum

Author： Weber M. Sirota J.M. Reuter D.C.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.177, Iss.2, 1996-06, pp. : 211-220

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Abstract

Absolute intensities of PR branch transitions in the three hotbands 2nu 2 f 2 >- nu 1 f 2 2nu 2 e 2 >- nu 1 e 2 and 2nu 0 e 2 >- nu 1 e 2 have been measured using high resolution spectra recorded with the McMath FTS at the National Solar Observatory in Kitt Peak, Arizona. The two latter bands show intensity perturbations mostly due to rotational l -type doubling while the hot band ending in the (02 2 f 0) state remains unperturbed. Based on mixing coefficients calculated from effective molecular constants, intensity perturbation factors were calculated which are shown to be equivalent to a quadratic term used in the Herman-Wallis factor expression. As part of the intensity retrieval, self-, N 2 -, and He-broadening coefficients of N 2 O were determined in the nu 2 fundamental and the three hot bands. The linewidths reported in this study have been combined with the best available literature data from other bands to retrieve temperature dependent relaxation rates due to rotationally inelastic collision based on a scaling law.