The interaction of spin-polarized cesium atoms with cesium and rubidium atoms under conditions of optical orientation of atoms is considered. On the basis of data on spin-exchange complex cross sections in the Cs–Cs and Cs–Rb systems, a calculation of a magnetic resonance frequency shift of cesium atoms in a Cs–Rb mixture, as well as comparison of the calculated values of the frequency shift with experimental data, is performed.

Optics and SpectroscopyJul 1, 20181 citation

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Afterglow of resonantly excited cesium ions in a He-Cs mixture

Sargis Ter-Avetisyan, Valeri O. Papanyan

Published May 1, 1997• 0 citations

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Excitation transfer between the

6 ^{2}P_{\frac{1}{2}}

and

6 ^{2}P_{\frac{3}{2}}

resonance states in cesium, induced by Cs-

{\mathrm{N}}_{2}

and Cs-

{\mathrm{H}}_{2}

collisions, was observed in the first experiment of its kind, in which techniques of sensitized fluorescence are used to investigate collisional mixing between resonance states of alkali atoms in mixtures with molecular gases. The cesium-vapor-gas system, in which the cesium vapor pressure was low enough to avoid radiation trapping, was irradiated with a single component of the resonance doublet. The fluorescent light, which contained both components of the doublet, was monitored at right angles to the direction of excitation. Measurements of relative intensities of the fluorescent components yielded the following cross sections for excitation transfer and for quenching of resonance radiation. For Cs-

{\mathrm{N}}_{2}

collisions: ${Q}_{12}(^{2}P_{\frac{1}{2}}\ensuremath{\rightarrow}^{2}P_{\frac{3}{2}})=3.6$

{\mathrm{\AA{}}}^{2}

, ${Q}_{21}(^{2}P_{\frac{1}{2}}\ensuremath{\leftarrow}^{2}P_{\frac{3}{2}})=16.2$

{\mathrm{\AA{}}}^{2}

, ${Q}_{10}(^{2}S_{\frac{1}{2}}\ensuremath{\leftarrow}^{2}P_{\frac{1}{2}})=55.2$

{\mathrm{\AA{}}}^{2}

, ${Q}_{20}(^{2}S_{\frac{1}{2}}\ensuremath{\leftarrow}^{2}P_{\frac{3}{2}})=63.5$

{\mathrm{\AA{}}}^{2}

. For Cs-

{\mathrm{H}}_{2}

collisions:

{Q}_{12}=6.7

{\mathrm{\AA{}}}^{2}

{Q}_{21}=29.6

{\mathrm{\AA{}}}^{2}

{Q}_{10}=11.7

{\mathrm{\AA{}}}^{2}

{Q}_{20}=6.7

{\mathrm{\AA{}}}^{2}

. The large sizes of the excitation-transfer cross sections, which are comparable to the corresponding Cs-Cs cross sections, are attributed to resonances with transitions in the molecules.