Collisional Broadening of Spectral Lines in Slow Atomic Collisions

• Published in: Russian journal of physical chemistry. B Vol. 17; no. 2; pp. 346 - 360
• Main Authors: Umanskii, S. Y., Adamson, S. O., Vetchinkin, A. S., Deminskii, M. A., Olkhov, O. A., Chaikina, Y. A., Shushin, A. I., Golubkov, M. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2023; Springer Nature B.V
• Subjects: Argon; Atmospheric models; Atomic collisions; Catalysis; Chemistry; Chemistry and Materials Science; Collisional broadening; Kinetics and Mechanism of Chemical Reactions; Line spectra; Physical Chemistry; interatomic interaction; nonadiabatic transition; elastic scattering; line broadening; radiation; spectral line contour
• ISSN: 1990-7931; 1990-7923
• DOI: 10.1134/S199079312302032X

A great deal of attention is being paid by researchers to the multilevel modeling of complex gas-phase physicochemical processes occurring in the atmosphere, during combustion, and in plasma-chemical installations. One of the most important microscopic processes determining the transfer of radiation in these systems is the broadening of spectral lines in collisions of radiating atoms with atoms in the ground state. In this paper, we propose a formulation of the unified Franck-Condon theory of the broadening of spectral lines in gases in terms of the theory of slow atomic collisions and nonadiabatic transitions. This makes it possible to select the most efficient channels leading to the broadening of collisions based on the form of the adiabatic potential curves of the colliding atoms and, on this basis, apply fairly simple models developed in the theory of nonadiabatic transitions. As an example of using this approach, the center and wings of the of the spectral line contour of the Ar(
3
P
1
) → Ar(
1
S
0
) emission of excited argon atoms in their own gas are calculated.