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Journal of Physics Conference Series

Observation of the spin polarization of Cs atoms during collisions with oriented metastable helium atoms

Victor A. Kartoshkin, Sergei Dmitriev, N. A. Dovator, G. V. Klement’ev

Published Sep 7, 2015• 0 citations
Publisher

Abstract

We are the first to experimentally observe a magnetic resonance signal of 6 2 S 1/2 Cs atoms by absorption of light from a helium lamp that was used to optically orient metastable 2 3 S 1 He atoms. The amplitude of the cesium signal proved to be almost three orders of magnitude lower than the amplitude of the magnetic resonance of 2 3 S 1 He atoms. The theoretical explanation of the effect is presented.

DOI
10.1088/1742-6596/635/2/022042

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We are the first to experimentally observe a magnetic resonance signal of 6 2 S 1/2 Cs atoms by absorption of light from a helium lamp that was used to optically orient metastable 2 3 S 1 He atoms. The amplitude of the cesium signal proved to be almost three orders of magnitude lower than the amplitude of the magnetic resonance of 2 3 S 1 He atoms. The theoretical explanation of the effect is presented.
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We have experimentally detected a signal of magnetic resonance (MR) from 85Rb atoms in the 52 S 1/2 state by measuring the absorption of light from a helium lamp producing optical orientation of metastable 23 S 1 4He atoms in a cell containing alkali metal vapor and gaseous helium at a pressure of 1 Torr. The ratio of MR signal amplitudes in Rb and He atoms did not exceed 10–2. Peculiarities of the formation and observation of the collisional polarization of Rb atoms in alkali–helium plasma are discussed.
The rate constant for spin exchange in a system consisting of a metastable helium atom and an alkali-metal atom is determined. An experiment on optical orientation of atoms established that the rate constant for spin exchange in a collision of a metastable 2 3 S 1 helium atom with a cesium atom in the 6 2 S 1/2 ground state equals (2.8±0.8)×10 −9 cm 3 s −1 . The rate constant for chemoionization of cesium atoms by metastable helium atoms was determined at the same time to be (1.0±0.3)×10 9 cm 3 s −1 .