Parallel Session: Infrared, Contributed Talk (15min)

Satellites in Infrared and Raman Spectra of Linear Molecules 

A. P. Kouzov3, A. V. Sokolov1, N. I. Egorova2
1Saint Petersburg State University, Universitetskaya emb., 7/9, 199034 Saint Petersburg, Russia, 2St. Petersburg University of State Fire Service of Emercom of the Russian Federation, St. Petersburg, 196105 Russia, 3Saint Petersburg State University, Universitetskay

A nonMarkov theory of diffuse satellites appearing around the allowed resonance rotational lines  perturbed by monoatomic buffer gases is expounded. As the buffer-gas pressure grows, the lorentzian mother lines adjacent to the band origin become attenuated because of the intensity transfer to surrounding satellites. Different channels contributing to the attenuation effect  of infrared and Raman lines of linear molecules are considered. The calculated attenuation coefficients reasonably agree with experimental data available for HCl and HF absorption spectra perturbed by noble gases [1-3]. .Based on the nonMarkov dynamical theory, the satellite formation  in the allowed spectra of dense media consisting of linear molecules is  treated. In this case, coupling of the  rotational transitions in neighbouring molecules results in the appearance of satellites at the combination frequencies.

Support from the Russian Foundation for Basic Research (grant 19-03-00830) is gratefully acknowledged.


[1] E. Piollet-Mariel, C. Boulet, and A. Levy, J. Chem. Phys. 1981, 74, 900.

[2] C. Boulet, P.-M. Flaud, and J.-M. Hartmann, J. Chem. Phys. 2004, 120, 11053.

[3] A. P. Kouzov, K. G. Tokhadze, and S. S. Utkina, Eur. Phys. J. D 2000, 12, 153.