Spectral line shape arising from collisional interference between electric-dipole-allowed and collision-induced transitions

B. Gao, G. C. Tabisz, M. Trippenbach, and J. Cooper
Phys. Rev. A 44, 7379 – Published 1 December 1991
PDFExport Citation

Abstract

A theory is developed to describe the spectral line shape due to interference between electric-dipole-allowed and collision-induced transitions in pure rotational molecular spectra. Motivation was provided by experimental data available for HD-inert gas systems. This theory is based on a master-equation approach to induced spectra employed by Alber and Cooper [Phys. Rev. A 33, 3084 (1986)]. The active molecule is considered to be immersed in a bath of perturbers. An expression for the absorption coefficient is obtained within the binary collision approximation that contains terms due to allowed, induced, and interference contributions. Effects due to m mixing, J mixing, and successive collisions are included. Low-order approximations of the theory eventually reduce to results of earlier efforts, namely, the pioneering description of collisional interference by Herman, Tipping, and Poll [Phys. Rev A 20, 2006 (1979)] and refinements to it through consideration of rotational level mixing. The principal attribute of this approach is the treatment of allowed and collision-induced transitions in a consistent manner.

  • Received 6 May 1991

DOI:https://doi.org/10.1103/PhysRevA.44.7379

©1991 American Physical Society

Authors & Affiliations

B. Gao, G. C. Tabisz, M. Trippenbach, and J. Cooper

  • Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder, Colorado 80309-0440

References (Subscription Required)

Click to Expand
Issue

Vol. 44, Iss. 11 — December 1991

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×