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Optics and Spectroscopy

Anomalous dependence of the magnetic resonance signal of cesium atoms in the afterglow in an N2-Ar mixture

Sergei P. Dmitriev, N. A. Dovator, Victor A. Kartoshkin

Published May 1, 2008• 0 citations
Publisher

Abstract

The investigation of spin-exchange collisions between optically oriented cesium atoms in the ground 2 S 1/2 state and nitrogen atoms in the ground 4 S 3/2 state reveals an anomalous behavior of the magnetic resonance signal of cesium atoms in the afterglow in an N2-Ar mixture, namely, the magnetic resonance signal is slowly enhanced during the time interval between the high-frequency pulses exciting a discharge in the absorption cell. It is found that such a behavior of the magnetic resonance signal is explained by a slow change in the concentration of nitrogen atoms in the absorption cell, which affects the magnetic resonance of cesium atoms via efficient spin exchange.

DOI
10.1134/s0030400x08050056

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The investigation of spin-exchange collisions between optically oriented cesium atoms in the ground 2 S 1/2 state and nitrogen atoms in the ground 4 S 3/2 state reveals an anomalous behavior of the magnetic resonance signal of cesium atoms in the afterglow in an N2-Ar mixture, namely, the magnetic resonance signal is slowly enhanced during the time interval between the high-frequency pulses exciting a discharge in the absorption cell. It is found that such a behavior of the magnetic resonance signal is explained by a slow change in the concentration of nitrogen atoms in the absorption cell, which affects the magnetic resonance of cesium atoms via efficient spin exchange.
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Collisions between sodium and potassium atom in the conditions of optical orientation of potassium atoms are considered. Because of collisions, the spin exchange occurs between colliding atoms, which leads to a magnetic resonance frequency shift of Na atoms. Calculations reveal that the magnetic resonance frequency shift of Na atoms in the upper hyperfine state (F = 2) changes its sign from negative to positive upon an increase in the temperature in the absorption chamber from 300 to 500 K and passes through zero near temperature T ~ 450 K, while the frequency shift of the lower hyperfine state (F = 1) remains negative in the entire range of investigated temperatures. An analogous effect is observed for the first time in the case in which the main contribution to the magnetic resonance frequency shift comes from the spin exchange.