Collisional decay rates of population, orientation, and alignment studied by stimulated photon echo technique in molecular gas SF6

L. S. Vasilenko; Natalia N. Rubtsova; E. B. Khvorostov

doi:10.1117/12.287701

26 September 1997 Collisional decay rates of population, orientation, and alignment studied by stimulated photon echo technique in molecular gas SF₆

L. S. Vasilenko, Natalia N. Rubtsova, E. B. Khvorostov

Author Affiliations +

Proceedings Volume 3239, Photon Echo and Coherent Spectroscopy; (1997) https://doi.org/10.1117/12.287701
Event: PECS '97: Photon Echo and Coherent Spectroscopy, 1997, Yoshkar-Ola, Russian Federation

Abstract

The method of a stimulated photon echo with specially selected linear polarizations of pumping pulses of a coherent resonant radiation is applied to a research of depolarizing collisions in molecular gas SF₆ and its mixtures with buffer gases He and Xe. For the first time in one experiment the rates of a collisional decay of three lowest moments of polarization (population, orientation and alignment) are defined in an ensemble of gas particles. These rates of a relaxation are measured as functions on longitudinal velocities of resonant particles. In the frames of an experimental accuracy any noticeable dependence on velocities of particles was not detected both for orientation and alignment neither in pure resonant gas SF₆ nor in mixtures. This result confirms the standard theoretical approach to depolarizing collisions. In pure SF₆ decay rates of orientation and alignment have proved lesser than relaxation rate constant due to velocity changing (elastic) collisions. It means, that only the part of elastic collisions participates in destruction of multipole polarization moments of resonant levels. In comparison with our previous work the evidence is obtained that the relaxation of multipole moments seems to be j-dependent one in a medium of molecular gas SF₆.

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L. S. Vasilenko, Natalia N. Rubtsova, and E. B. Khvorostov "Collisional decay rates of population, orientation, and alignment studied by stimulated photon echo technique in molecular gas SF₆", Proc. SPIE 3239, Photon Echo and Coherent Spectroscopy, (26 September 1997); https://doi.org/10.1117/12.287701

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