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Optics and Spectroscopy

Observation of polarized atoms of rubidium isotopes in experiments on optical orientation in a He–Rb mixture under conditions of a pulsed gas discharge

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

Published Nov 1, 2016• 4 citations
Publisher

Abstract

We are the first to have observed magnetic resonance signals from atoms of 85 Rb and 87 Rb isotopes when using the indirect optical orientation in conditions of helium–rubidium gas discharge plasma. An anomalously small ratio of magnetic resonance signals from isotopes of rubidium and metastable helium upon optical orientation of 4 Не atoms has been detected. The experimental results have been considered theoretically, and an explanation of the observed anomaly in the signals is presented.Z

DOI
10.1134/s0030400x16110102

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Observation of polarized alkali atoms in experiments on optical orientation in a He–Rb and He-Cs mixture under conditions of a pulsed gas discharge

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

Victor A. Kartoshkin, Sergei Dmitriev, N. A. Dovator +1 more

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.

Journal of Physics Conference Series•Sep 7, 2015•0 citations
We are the first to have observed magnetic resonance signals from atoms of 85 Rb and 87 Rb isotopes when using the indirect optical orientation in conditions of helium–rubidium gas discharge plasma. An anomalously small ratio of magnetic resonance signals from isotopes of rubidium and metastable helium upon optical orientation of 4 Не atoms has been detected. The experimental results have been considered theoretically, and an explanation of the observed anomaly in the signals is presented.Z
It has been demonstrated that optical pumping of alkali atoms (rubidium and cesium) results to a highly efficient indirect optical orientation of metastable He (2 3 S 1 ) atoms. However, in an attempt to perform the inverse experiment (i.e. to receive spin-polarization of alkali atoms upon optical pumping of metastable helium atoms) the result was quite unexpected: the magnetic resonance signal of Cs or Rb atoms was very weak (several hundred times weaker compared to conventional optical pumping of helium in the presence of cesium (rubidium)). We propose an explanation for the unusually small ratio of the magnetic resonance signals from Cs (Rb) and metastable He atoms under condition of optical orientation of He atoms. Except of Cs atoms we are the first to have observed magnetic resonance signals from atoms of 85 Rb and 87 Rb isotopes when using the indirect optical orientation in conditions of helium-rubidium gas discharge plasma. It is shown that the anomaly in the amplitude ratios of the observed MR signals can be explained by the unidirectional action of three different factors (the presence of a large nuclear spin of alkali atoms, depolarization of alkali atoms between collisions, and spin exchange between atoms of rubidium isotopes (for the He-Rb system).
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.
We are the first to experimentally observe a magnetic-resonance signal of 62 S 1/2 Cs atoms by absorption of light from a helium lamp that was used to optically orient metastable 23 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 23 S 1 He atoms. Particular features of the creation and observation of the collisional polarization of cesium under conditions of alkali-helium plasma have been discussed.