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Formation of linear polarization of light during combined anisotropic collisional relaxation of alignment and octupole orientation of the atomic state with J=3/2

A. G. Petrashen, V. N. Rebane, T. K. Rebane

Optics and SpectroscopyJul 1, 19901 citation

Anisotropic collisional relaxation of the order in atomic angular momenta and related polarization effects during laser excitation

A. G. Petrashen, V. N. Rebane, T. K. Rebane

Journal of Experimental and Theoretical PhysicsAug 1, 19931 citation

Dependence of the broadening and shift of a spectral line on polarization in the anisotropic collision of atoms with charged particles

V. H. Rebane

OptSpNov 1, 19770 citations

Alignment of atomic states by collisions with slow charged particles

A. G. Petrashen, V. N. Rebane, T. K. Rebane

The alignment of atomic states as the result of collisions with a beam of slow charged particles is investigated. The problem of the collisional reorientation of atomic moments is solved by numerical integration of the equations of the impact parameter method taking into account charge--quadrupole interaction. Calculations are made of the alignment of the /sup 2/P/sub 3//sub ///sub 2/ levels of alkali atoms populated by collisions with selective excitation of the /sup 2/P/sub 1//sub ///sub 2/ level. The linear polarization of light emitted by the /sup 2/P/sub 3//sub ///sub 2/ level attains some tens of percents and corresponds to the predominance of polarization in directions perpendicular to the beam. The efficiency of the resulting alignment depends on the volume density but not on the velocity of the beam of charged particles. Thus the slow drift of ions (and electrons) in a gas-discharge plasma can compete with alignment as the result of fluxes of charged particles. We shall formulate the sum rules for anisotropic collisional relaxation of atomic polarization moments. It follows from these that for the appearance of alignment in intramultiplet mixing under the action of anisotropic collisions we require a nonuniform population of multiplet levels that differs from the more » ratio of their statistical weights. « lessThe alignment of atomic states as the result of collisions with a beam of slow charged particles is investigated. The problem of the collisional reorientation of atomic moments is solved by numerical integration of the equations of the impact parameter method taking into account charge--quadrupole interaction. Calculations are made of the alignment of the /sup 2/P/sub 3//sub ///sub 2/ levels of alkali atoms populated by collisions with selective excitation of the /sup 2/P/sub 1//sub ///sub 2/ level. The linear polarization of light emitted by the /sup 2/P/sub 3//sub ///sub 2/ level attains some tens of percents and corresponds to the predominance of polarization in directions perpendicular to the beam. The efficiency of the resulting alignment depends on the volume density but not on the velocity of the beam of charged particles. Thus the slow drift of ions (and electrons) in a gas-discharge plasma can compete with alignment as the result of fluxes of charged particles. We shall formulate the sum rules for anisotropic collisional relaxation of atomic polarization moments. It follows from these that for the appearance of alignment in intramultiplet mixing under the action of anisotropic collisions we require a nonuniform population of multiplet levels that differs from the more » ratio of their statistical weights. « less

Optics and SpectroscopyAug 1, 19840 citations

Polarization and Correlation Phenomena in Atomic Collisions

Vsevolod V. Balashov, Alexei N. Grum-Grzhimailo, Nikolai M. Kabachnik

Springer eBooksJan 1, 2000306 citations

Manifestation of higher polarization moments of the electronic shell of an atom in the collisional population transfer between the hyperfine-structure levels

V. N. Rebane, T. K. Rebane

The contributions of the relaxation of electronic polarization moments of various orders κ to the probabilities for the population transfer between the hyperfine-structure levels of an atom under the action of collisions are studied. It is shown that the contributions of higher electronic polarization moments with κ > 2 are comparable with the contributions of the orientation (κ=1) and the alignment (κ=2) or even exceed them in magnitude. This opens up the possibility of studying the collisional relaxation of higher polarization moments which are usually not observed and not involved in the emission and absorption of light under dipole transitions. The bounds for the allowable values of the rate constants for the collisional relaxation of higher polarization moments are obtained from the condition for nonnegativity of the total probabilities of population transfer between different hyperfine-structure levels under the action of collisions.The contributions of the relaxation of electronic polarization moments of various orders κ to the probabilities for the population transfer between the hyperfine-structure levels of an atom under the action of collisions are studied. It is shown that the contributions of higher electronic polarization moments with κ > 2 are comparable with the contributions of the orientation (κ=1) and the alignment (κ=2) or even exceed them in magnitude. This opens up the possibility of studying the collisional relaxation of higher polarization moments which are usually not observed and not involved in the emission and absorption of light under dipole transitions. The bounds for the allowable values of the rate constants for the collisional relaxation of higher polarization moments are obtained from the condition for nonnegativity of the total probabilities of population transfer between different hyperfine-structure levels under the action of collisions.

Optics and SpectroscopyJan 1, 20020 citations

Relaxation of the polarization moments of the atomic states J=3/2 and 2 under the action of anisotropic collisions

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Relaxation of the polarization moments of the atomic states J=3/2 and 2 under the action of anisotropic collisions

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