Study of the rates of collisional decay of population, orientation, and alignment by stimulated photon echo in a molecular gas |
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Authors: | L S Vasilenko N N Rubtsova E B Khvorostov |
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Institution: | (1) Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia |
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Abstract: | A stimulated photon echo technique with specially selected linear polarizations of the coherent resonant driver pulses is
used to study depolarizing collisions in the molecular gas SF6 and in mixtures of it with buffer He and Xe. The collisional decay rates of the population, orientation, and alignment in
an ensemble of gas particles are determined for the first time in a single experiment. These relaxation rates are measured
as a function of the longitudinal translational velocities of the resonant particles. To within the experimental accuracy,
no significant dependence of the collisional decay rates on the translational velocities of the particles was observed. This
result confirms the conventional theoretical approach to depolarizing collisions. In pure SF6 the decay rates for the orientation and alignment were lower than the relaxation constant for collisions involving a change
in the longitudinal velocity (elastic collisions) that is known from experimental observations of the ordinary photon echo.
This means that only some of the elastic collisions participate in destroying the multipole moments of the levels. Evidence
is found that the relaxation of the multipole moments created by polarized radiation in a resonant medium of molecular SF6 gas depends on j, the total angular momentum of the level.
Zh. éksp. Teor. Fiz. 113, 826–833 (March 1998) |
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