Combined effect of small- and large-angle scattering collisions on a spectral line shape. (July 2015)

• Record Type: Journal Article
• Authors: Kochanov, V.P.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 159(2015:Sep.)
• Page Start: 32
• Page End: 38
• Publication Date: 2015-07
• Subjects: Line profiles -- Soft collisions -- Line narrowing -- Speed-dependence; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2015.02.017
• Languages: English
• ISSNs: 0022-4073

Abstract

Abstract: Algebraic approximations for line profiles calculated on the basis of quantum-mechanical collision integral kernels for dipole–dipole, dipole–quadrupole, and quadrupole–quadrupole intermolecular interaction potentials were obtained. In derivation of the profiles velocity-changing collisions of molecules with scattering on small and large angles also with the speed-dependence of collision relaxation constants have been taken into account. It was shown that the relative contribution of small-angle collisions into the frequency of elastic velocity-changing collisions is much more pronounced for long-range potentials. A sensitive criterion for analysis of a line narrowing was proposed and tested. Highlights: Line profiles are developed with account of soft and hard collisions. Main types of intermolecular interaction were taken into account. A criterion for the analysis of a spectral line narrowing was proposed. Two types of line narrowing were considered.