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Line Broadening and Mixing in NH3 Inversion Doublets Perturbed by NH3, He, Ar, and H2

✍ Scribed by S. Hadded; H. Aroui; J. Orphal; J.-P. Bouanich; J.-M. Hartmann

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 153 KB
Volume: 210
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.2001.8452

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✦ Synopsis

Measurement of absorption by pure ammonia and NH 3 -(H 2 , He, and Ar) mixtures in the P branch of the ν 4 band at room temperature have been made with a high-resolution Fourier transform spectrometer. Least squares fits of the spectra using different techniques are used for the analysis of the evolution with pressure of the absorption shape for a number of P P inversion doublets. Intensities, half-widths, and line-coupling parameters are determined, demonstrating the great importance of linemixing effects. The results are compared with values calculated using a semiclassical model. The latter explains most of the features of the line-broadening and the J and K dependencies of line-coupling for pure NH 3 , whereas poorer results are obtained for line-mixing in mixtures. The most striking and original result is the very large amount of coupling between the symmetric and antisymmetric components, which can reach up to 80% of the width in the case of pure NH 3 . Also remarkable is the very strong influence of the rotational quantum number K .

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