Accession Number : AD0663440

Title :   THE ROTATION-TRANSLATION-COUPLING EFFECT IN NOBLE-GAS CRYSTALS CONTAINING MOLECULAR IMPURITIES,

Corporate Author : WEIZMANN INST OF SCIENCE REHOVOTH (ISRAEL)

Personal Author(s) : Friedmann,H. ; Kimel,S.

Report Date : APR 1967

Pagination or Media Count : 62

Abstract : A generalized perturbation theory was developed valid in the case where the perturbation can no longer be considered as small relative to the separation between successive unperturbed energy levels. This is applied to the problem of coupling between the rotational and translational motions of a molecule trapped in a spherically symmetric cell. A representation which is diagonal with respect to the total angular momentum and parity operators has been used, taking advantage of the rotation-inversion symmetry presented by the cell model. It has been found possible to obtain closed expressions for the perturbed energy levels valid in the case of near resonance between rotational and translational frequencies. General expressions for the intensity of rotation-translation transitions have also been derived. A quantitative discussion is given of the effect of finite line width on the position of maxima of 'hot' lines. The theory is applied to the interpretation of the spectra of hydrogen halides trapped in noble-gas crystals. (Author)

Descriptors :   (*SOLIDIFIED GASES, *INFRARED SPECTROSCOPY), RARE GASES, CRYSTALS, IMPURITIES, PERTURBATION THEORY, ATOMIC ENERGY LEVELS, LINE SPECTRA, HYDROGEN COMPOUNDS, HALIDES, HYDROCHLORIC ACID, CRYSTAL LATTICES, ISRAEL

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE