Spectral line shape of the P(2) transition in CO-Ar: Uncorrelated ab initio calculation

Journal Article · Sun Dec 01 00:00:00 EST 2002 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.66.062502· OSTI ID:20632432

Wehr, R; Vitcu, A; Drummond, J R; May, A D ^[1]; Ciurylo, R ^[2]; Thibault, F ^[3]

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1. Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7 (Canada)
2. Institute of Physics, Nicholas Copernicus University, Grudziadzka 5/7, 87-100 Torun (Poland)
3. UMR 6627 du CNRS, Universite de Rennes, Campus de Beaulieu, 34042 Rennes Cedex (France)

We calculate the spectral line shape of an isolated line from first principles, assuming that the translational motion is not statistically correlated with the evolution of the optical coherence, i.e., with the broadening. We use the known, realistic potentials for the influence of collisions on the translational motion and on the internal motion. We show that the calculated profiles do not agree, particularly at low pressures, with very precise experimental profiles of the P(2) line of CO in a bath of Ar. We establish that the source of the disagreement lies in the assumption of uncorrelated effects of collisions on the translational motion and the optical coherence associated with the internal degrees of freedom.

• OSTI ID: 20632432
• Journal Information: Physical Review. A, Vol. 66, Issue 6; Other Information: DOI: 10.1103/PhysRevA.66.062502; (c) 2002 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
CARBON MONOXIDE
DEGREES OF FREEDOM
ENERGY-LEVEL TRANSITIONS
EVOLUTION
POTENTIALS
SHAPE
VISIBLE RADIATION