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Journal of Experimental and Theoretical Physics

Depolarizing Collisions of Ytterbium Atoms with Inert Gas Atoms

Н. Н. Рубцова, Sergei A. Kochubei, Хворостов Евгений Борисович, Решетов Владимир Александрович

Published Oct 1, 2021• 4 citations
Publisher

Abstract

Abstract Experimental data have been obtained for the relaxation rates of population, orientation, and alignment of the 174Yb(6s6p)3P1 level due to collisions of 174Yb atoms with atoms of noble gases.
DOI
10.1134/s1063776121100101

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EFFECT OF TEMPERATURE ON THE RELAXATION CROSS SECTIONS OF THE ''ORIENTATION'' AND ''ALIGNMENT'' OF $sup 198$Hg ATOMS IN THE 6$sup 3$P$sub 1$ STATE BY COLLISION AGAINST RARE GAS ATOMS.

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Polarization stimulated photon echo technique is applied to measure the difference between relaxation rates of alignment and orientation of the level 3P1 (6s6p) of 174Yb. At the transition 1S0 (6s2) - 3P1 (6s6p) 174Yb (of type 0 ↔ 1) a collision induced echo is revealed, which is generated by two pulses of linear and mutually orthogonal polarizations. Photon echo arises exclusively due to collisions between atoms of ytterbium and buffer gases; its power depends non-monotonously on the buffer pressure, and the echo polarizations coincides with the polarization of the first exciting pulse of radiation.
Isotropic depolarizing collisions are studied using a stimulated photon echo with a specific polarization of the excitation radiation pulses in a mixture of ytterbium with krypton for the J = 1 ⇄ J = 0 transition of 174Yb. The difference between the relaxation rates of orientation and alignment γ (2) − γ (1) of the 3 P 1(6s6p) 174Yb level is measured as a function of the krypton pressure. The collision photon echo at the J = 1 ⇄ J = 0 transition induced by the anisotropic relaxation is studied for the Yb + Xe mixture. The power of the collision echo increases from zero with the addition of a buffer gas to ytterbium, reaches an optimal level, and decreases with an increase in the buffer gas pressure. The polarization of this collision-induced echo differs from the polarization of the conventional echo. The experimental results are in qualitative agreement with theoretical predictions.
A photon echo induced exclusively by collisions of ytterbium atoms with buffer gas atoms has been observed at a 0 ⟷ 1-type1 S 0(6s 2)-3 P 1(6s6p) 174Yb transition. The polarization properties of a collision echo and the buffer gas density dependence of its intensity agree with theoretical predictions of a model of depolarizing collisions that takes into account the dependence of a relaxation matrix on the velocity of active particles. Thus, direct experimental evidence of the relaxation anisotropy due to depolarizing collisions has been obtained.
EFFECT OF TEMPERATURE ON THE RELAXATION CROSS SECTIONS OF THE ''ORIENTATION'' AND ''ALIGNMENT'' OF sup198sup 198sup198Hg ATOMS IN THE 6sup3sup 3sup3Psub1sub 1sub1 STATE BY COLLISION AGAINST RARE GAS ATOMS.