Role of the induced dipole moment in the collisional interference in the pure rotational spectrum of HD-He and HD-Ar
- Department of Physics, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 (Canada)
- Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606 (United States)
- Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)
The parameters describing the interference between allowed and collision-induced transitions in the far-infrared spectrum of HD-He and HD-Ar are computed following the formalism of Gao {ital et} {ital al}. [Phys. Rev. A 44, 7379 (1991)] and the calculational procedure of Gao {ital et} {ital al}. [Phys. Rev. A 46, 5781 (1992)]. The contribution from each component of the induced-dipole moment is identified. The interference between the induced-dipole component having the same symmetry as the allowed moment and the allowed moment itself has the largest single contribution to the intensity interference effect. The mixing of rotational levels by an anisotropic intermolecular interaction introduces other components into the interference mechanism. The overall effect is usually to decrease the magnitude of the interference and to permit line broadening and asymmetry to occur. This interaction is most effective in causing the anisotropic overlap-induced pair dipole moment {ital B}{sub 2}(21) to play a role in the interference mechanism. The effect of the isotropic overlap-induced dipole moment is usually negligible.
- OSTI ID:
- 115903
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 52; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Temperature dependence of the collisional interference in the pure rotational far-infrared spectrum of HD
Collisional interference in the infrared absorption spectrum of HD