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Physical Review A

Anisotropy-dependent circular polarization spectroscopy

S. B. Bayram, Ramesh Marhatta

Published Sep 8, 2008• 2 citations
Publisher

Abstract

We have experimentally investigated the anisotropy-dependent circular polarization spectra of the $^{133}\mathrm{Cs}$ $6s^{2}S_{1∕2}\ensuremath{\rightarrow}6p^{2}P_{3∕2}\ensuremath{\rightarrow}10s^{2}S_{1∕2}$ double-resonance transition in the presence of Ar. Satisfaction of double-resonance condition, achieved by use of a two-photon two-color pulse laser excitation scheme, was monitored by measurement of the intensity of the $9p^{2}P_{1∕2}\ensuremath{\rightarrow}6s^{2}S_{1∕2}$ cascade fluorescence at $361.73\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. In the experiment anisotropies, namely, alignment and orientation in the $6p^{2}P_{3∕2}$ level, were produced from circularly polarized light with positive helicity. Then, a circular polarization degree was measured when both lasers were circularly polarized with positive helicities, and alternately positive and negative helicities for the $6p^{2}P_{3∕2}\ensuremath{\rightarrow}10s^{2}S_{1∕2}$ transition. From the measurement, we obtained the orientation-dependent depolarization cross section in the $6p^{2}P_{3∕2}$ level due to collisions with ground-level argon atoms. A disorientation cross section value of 151 $(42)\phantom{\rule{0.3em}{0ex}}{\mathrm{\AA{}}}^{2}$ is reported.

DOI
10.1103/physreva.78.033403

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Measurements of collisional depolarization cross sections play an important role in gaining valuable information about the interaction between inert and rare-gas atoms.A key element in understanding collisional dynamics is the detailed analysis of the polarization of the emitted photons.In order to investigate the collisional cross section of the excited J=1/2 cesium atoms, by collisions with the ground level argon atoms, experimental measurements were made studying circular polarization spectra.Orientation in the J=1/2 level was optically induced by circularly polarized light with a positive helicity.A two-photon double-resonance (6s 2 S 1/2 →6p 2 P 1/2 → 10s 2 S 1/2 ) condition was achieved using nanosecond pulsed dye lasers, and the intensity of the cascade fluorescence was monitored in the presence of argon atoms ranging from 10 -4 torr to 100 torr.
An experimental investigation of the Cs 6s {sup 2}S{sub 1/2}{yields}6p {sup 2}P{sub 3/2}{yields}10s {sup 2}S{sub 1/2} double-resonance two-photon polarization spectrum has been made. In the investigation, a linear polarization degree was measured to extract the alignment depolarization cross section in the cesium 6p {sup 2}P{sub 3/2} level due to collisions between ground-level argon and excited 6p {sup 2}P{sub 3/2} cesium atoms over the Zeeman coherences. The spectra show strong depolarization of the Cs 6p {sup 2}P{sub 3/2} level. The measured alignment depolarization cross section value of 186 (58) A{sup 2} is in good agreement with the experiment and theoretical predictions.
An experimental investigation of the Cs 6s 2S1/2→6p 2P3/2→10s 2S1/2 double-resonance two-photon polar-ization spectrum has been made. In the investigation, a linear polarization degree was measured to extract the alignment depolarization cross section in the cesium 6p 2P3/2 level due to collisions between ground-level argon and excited 6p 2P3/2 cesium atoms over the Zeeman coherences. The spectra show strong depolarization of the Cs 6p 2P3/2 level. The measured alignment depolarization cross section value of 186 58 Å2 is in good agreement with the experiment and theoretical predictions. DOI: 10.1103/PhysRevA.73.042713 PACS numbers: 32.80.t, 32.70.n I.
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