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Soviet Journal of Quantum Electronics

Role of cell walls in experiments on light-induced drift

P. L. Chapovsky, Anatolii M. Shalagin

Published Dec 31, 1986• 2 citations
Publisher

Abstract

In a set of experiments aimed at observing a light-induced drift of atoms and molecules, it was found that particle drift due to a difference between the characteristics of collisions of excited and unexcited particles with cell walls was not observed. The observed changes in the gas state were completely due to a volume light-induced drift.

DOI
10.1070/qe1986v016n12abeh008518

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Physical Review A•Aug 1, 1988•15 citations
In a set of experiments aimed at observing a light-induced drift of atoms and molecules, it was found that particle drift due to a difference between the characteristics of collisions of excited and unexcited particles with cell walls was not observed. The observed changes in the gas state were completely due to a volume light-induced drift.
Abstract : The effect of light-induced drift (LID) in gases, predicted by Gel'mukhanov and Shalagin and observed later, is manifested in mechanical drift of the absorbing atoms (molecules) in response to optical excitation. The effect of LID takes place if the atom interaction with light is velocity-dependent (due to the Doppler effect), the spectrum of the exciting radiation is asymmetric with respect to the the absorption line, and the absorbing molecules experience collisions with a buffer gas, with the collision rate dependent upon their internal state. The idea of LID is the following. Suppose for the sake of definiteness that the collision frequency of the absorbing molecules with the buffer is greater in the excited state and that the exciting light is red-shifted with respect to the absorption contour. Then due to the Doppler shift, the radiation interacts mainly with the counter-moving molecules, which undergo transitions into an excited state, in which their friction upon the buffer component is increased. Due to this increase, the counter-flying molecules are slowed down, while the molecules moving in the direction of light are not affected. The net effect is a drift of the absorbing component in the direction of light. The drift alternates its direction with the change of signs of either the detaining or the difference in the collision frequencies.
Conventional light-induced drift is based on purely elastic velocity-changing collisions. The authors discuss qualitatively the potentialities of light-induced drift originating from inelastic velocity-changing collisions, which may occur in a molecular buffer gas. In such collisions a large fraction of the electronic excitation energy of the absorbing particle may be transformed into kinetic energy thus affecting light-induced drift. The authors report experiments on light-induced drift of Na in various molecular buffer gases and compare these with their predictions.
An observation of light-induced drift (LID) of atoms with an intermediate metastable level between the ground and excited resonance levels is reported. The drift of atoms of barium was investigated. Molecular nitrogen was used as a buffer gas. The 5d 1^{1}1D metastable state of Ba atoms was quenched in collisions with N2{\mathrm{N}}_{2}N2​ molecules. It has been deduced from the experimental results that the collision cross section of Ba atoms with N2{\mathrm{N}}_{2}N2​ molecules is larger for Ba atoms in the ground state than in the 6p 1^{1}1P excited state. The maximal LID velocity was about 250 cm/s.