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Journal of Quantitative Spectroscopy and Radiative Transfer

Effect of population redistribution through Na∗-Ar and Na∗-Na∗ collisions on saturation curves in a vapour cell

C.A. van den Wijngaart, P. Kuik, H.A. Dijkerman, Tj. Hollander, L. Krause, Cornelis Th. J. Alkemade

Published Jan 1, 1986• 3 citations
Publisher
DOI
10.1016/0022-4073(86)90087-7

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The authors have measured time-resolved fluorescence spectra of the Na D lines in an Ar-filled vapour cell, excited by a high-intensity, pulsed dye laser of narrow bandwidth, which was tuned near the D 1 line. The results were compared with a recent theory which also takes into account the polarisation of the laser and the Zeeman degeneracy of the atomic levels. In particular, they predicted and observed a splitting into two components of the D 2 line (whose upper level is populated by mixing collisions), which is a new effect. Because of experimental difficulties, however, they obtained at most a semiquantitative agreement between theory and experiment.
Redistribution and depolarisation of light scattered by atoms undergoing collisions outside the impact region of the line profile has been studied experimentally and theoretically. In a cell experiment intensity and linear degree of polarisation of the fluorescence components 32S1/2 to or from 32P1/2,3/2 of Na atoms induced by collisions with Ar buffer gas atoms were measured as functions of the laser frequency omega L. The decrease of polarisation of the D2 component observed when omega L is shifted away from the D2 toward D1 resonance disagrees with calculations on the basis of the factorisation approximation of the theory of redistribution. Using Baylis (1975) potentials for the Na/Ar system, the effect is interpreted in terms of adiabatic coupling of the 32P3/2 electronic angular momentum to the collision axis during 'strong' collisions, giving rise to a greater than average depolarisation.