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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Spin orientation of ground state Rb atoms following photodissociation of RbI at 266 nm

Dmitriy V. Kupriyanov, B. V. Picheyev, Oleg S. Vasyutinskii

Published Jun 10, 1996• 0 citations
Publisher

Abstract

Oriented ground state 52S1/2 Rb atoms produced in molecular photodissociation had been observed and studied. The cell containing low-pressure RbI vapors was illuminated by pulse circularly polarized laser radiation at 266 nm. Resulting polarized Rb atoms had been detected using transmission monitoring technique in two experimental geometries. Oriented atomic spin precession in an external magnetic field was detected by atomic vapors dichroism.

DOI
10.1117/12.242174

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Oriented ground state 52S1/2 Rb atoms produced in molecular photodissociation had been observed and studied. The cell containing low-pressure RbI vapors was illuminated by pulse circularly polarized laser radiation at 266 nm. Resulting polarized Rb atoms had been detected using transmission monitoring technique in two experimental geometries. Oriented atomic spin precession in an external magnetic field was detected by atomic vapors dichroism.
A study has been made on the oriented ground state 5 2 S 1/2 Rb atoms produced in molecular photodissociation. Low-pressure RbI vapours have been photolysed by a beam of circularly polarized impulse laser radiation at 266 nm. The resulting Rb atoms were probed by a resonance atomic line at 794.8 nm from a discharge Rb lamp in two different experimental geometries. A free precession of the oriented atomic spins in an external magnetic field was detected by a dichroism of the atomic vapours. The initial degree of spin orientation was found to be P c = (20 +or- 2)%.
The angular distribution of spin-oriented Rb photofragments produced by photodissociation of RbI molecules using circularly polarized UV light at 266 nm has been investigated for the first time applying the method of Doppler-resolved paramagnetic Faraday rotation. The observed signals could successfully be explained as the sum of two contributions being due to incoherent and coherent excitation of the RbI molecules. For the ratio of the two corresponding anisotropy parameters we obtain a value of −0.33 as a preliminary result.
The optical magnetic birefringence (Faraday) technique that can be used to study the anisotropy distributions of the angular momenta of photofragments produced in molecular photodissociation is compared theoretically and experimentally with the magnetic dichroism technique. The frame independent tensor form of the general expression describing the difference between an initial and a final polarization matrix of a probe light beam passing through the photofragment vapor is presented and analyzed. The procedure of detection of the photofragment electron orientation and alignment angular distributions by Doppler spectroscopy using each of the techniques is studied theoretically. The angular independent anisotropy orientation and alignment parameters describing photodissociation dynamics that can be determined from these studies are presented. It is shown that in principle each of the techniques can give the same information about the photodissociation dynamics; however, the birefringence technique has an undeniable advantage since it leads to an increase in accuracy of the experimental data. Both magnetic birefringence and magnetic dichroism techniques were used experimentally to study the spin orientation of ground state Rb atoms produced in photodissociation of RbI at 266 nm by circularly polarized laser light. The experiment was not of the Doppler spectroscopy type, but use of different 85 Rb and 87 Rb isotopes in the dissociation cell and in the probe light source allows detection of the oriented atomic photofragments separately by each of the techniques. Obtained experimental results are in agreement with the theoretical predictions. Contribution of the orientation of the Rb hyperfine structure energy states to the observed signals were also studied and treated theoretically. The initial degree of the electron spin orientation of the Rb atoms produced in the reaction was found to be P e = 0.11 ± 0.02.
The photodissociation of RbI molecules via the second excited state under the action of circularly polarized radiation with a wavelength of 266 nm is studied. By using sub-Doppler Faraday spectroscopy, the angular distributions of the orientation of spins of Rb(5 2 S 1/2 ) atoms formed are studied and the anisotropy parameters describing these angular distributions are determined. Based on the anisotropy parameters, the ratio between the amplitudes of the inelastic scattering matrix elements corresponding to the two possible photodissociation channels is determined to be r Ω=1 / r Ω=0 =0.71±0.15, while the phase difference for these matrix elements is found to amount to Δφ = 173° ± 29°.
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.