Broadening and collisional interference of lines in the IR spectra of ammonia: Self-broadening in the ν1 band


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Abstract

The relaxation parameters of the lines of the P, Q, and R branches of the ν1 ammonia ν1 band are calculated in the case of self-broadening. In the case of doublets, the effects of collisional interference of the doublet components have been taken into account. It is shown that the cross-relaxation parameters of the components can reach ~60% of the values of the self-broadening coefficients, which gives rise to the narrowing of the components and indicates that the isolated line approximation is inapplicable. Comparison with experimental data is made. Good agreement for self-broadening coefficients is obtained. In the case of the self-shift coefficients, discrepancies are considerable in both magnitude and sign, and it is impossible to elucidate their reasons without invoking additional experimental data.

About the authors

M. R. Cherkasov

National Research Tomsk Polytechnic University; Yurga Institute of Technology

Author for correspondence.
Email: mrchrksv@mail.ru
Russian Federation, Tomsk, 634050; Yurga, Kemerovo oblast, 652055

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