Interaction-induced dipole and absorption spectra of collisional He-Ar pairs
- Physics Department, University of Texas at Austin, Texas 78712-1081 Physics Department, St. Petersburg University, St. Petersburg (Russia)
We compute the absorption coefficient in the far infrared of collisional He-Ar pairs for comparison with measurements at four temperatures (140, 165, 200, and 240 K) in mixtures of helium and argon. An accurate {ital ab} {ital initio} dipole surface and an advanced model of the He-Ar interaction potential are input. The comparison with the measured absorption spectra shows agreement, generally within the accuracy of the measurement of roughly 10{percent}. This fact suggests that this {ital ab} {ital initio} dipole surface of He-Ar pairs is probably as accurate as it was claimed to be ({plus_minus}3{endash}5{percent}) in the range where the optical interactions take place at the above temperatures. Three types of line profiles are considered: classical, quantal, and a {open_quote}{open_quote}symmetrized{close_quote}{close_quote} quantal profile, which has been believed to approximate the classical profile. Classical and symmetrized profiles diverge, however, with increasing frequency. This fact suggests that analyses of measured spectra based on symmetrized profiles should be reconsidered. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397561
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 6 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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