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Nuclear Science and Techniques

Three—body collisions involving Na（3P）,Rb（5S） and buffer gas atoms

沈异凡, 李万兴

Published Jan 1, 1996• 0 citations
OpenAlex

Abstract

Energy pooling in the Na-Rb vapor mixture has been investigated.While some kind of buffer gas is introduced into the cell the peculiar features appear.The buffer gas enhances the energy transfer betwwen Na(3P) and Rb(5S),which can be detected through the effects induced on the highly excited states populated by the Na(3P)/Rb(5P) and Rb(5P)/Rb(5P) collisions.

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[Energy-pooling collisions of rubidium atoms: Rb (5P(J)) + Rb (5P(J))--> Rb (5S) + Rb (nl = 5D,7S)].

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Journal of Atomic and Molecular Physics•Jan 1, 2008•0 citations
Energy pooling in the Na-Rb vapor mixture has been investigated.While some kind of buffer gas is introduced into the cell the peculiar features appear.The buffer gas enhances the energy transfer betwwen Na(3P) and Rb(5S),which can be detected through the effects induced on the highly excited states populated by the Na(3P)/Rb(5P) and Rb(5P)/Rb(5P) collisions.
Rate coefficients for energy-pooling (EP) collisions Rb(5P_(J))+Cs(6P_(3/2))-->Rb(5S_(1/2))+Cs(nl_(J')) have been measured. Atoms were excited to Rb(5P_(J)) and Cs(6P_(3/2)) states using two single-mode diode lasers. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique has been adopted. The excited-atom density and spatial distribution are mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam, tuned to Rb(5P_(J)-->7S_(1/2)) and Cs(6P_(3/2)-->8S_(1/2)) transitions respectively, which could be translated parallelly to the pump beams. The excited atom densities are combined with the measured fluorescence ratios to determine cross sections for the EP processes. It was found that Rb(5P_(J))+Cs(6P_(3/2)) collisions are more efficient than Rb(5P_(3/2))+Cs(6P_(3/2)) collisions for populating Cs(4F_(5/2)), while the opposite is true for populating Cs(4F_(7/2)).
An experimental study of rubidium energy pooling collisions, Rb(5P(J)) + Rb(5P(J))-->Rb(nlJ') + Rb(5S), at thermal energies, was carried out in a cell. Atoms were excited to either the 5P 1/2 or 5P 3/2 state using a single-mode diode laser. The excited atom density and spatial distribution were mapped by monitoring the absorption of a counter-propagating single-mode diode laser beam, tuned to either 5P 1/2-->5D 3/2 or 5P 3/2-->7S 1/2 transition, which could be translated parallel to the pump beam. The excited atom densities were combined with the measured fluorescence ratios to determine cross sections for the rubidium energy pooling process. For 5P 3/2 excitation the cross sections for nlJ' being 5D 5/2, 5D 3/2, and 7S 1/2 are (1.32+/-0.59) x 10(-14), (1.18+/-0.53) x 10(-14) and (3. 21+/-1. 44) x 10(-15) cm2, respectively. For 5P 1/2 excitation the cross sections for nlJ' being 5D 5/2 and 5D 3/2 are (6.57+/-2.96) x 10(-15), and (5.90+/-2.66) x 10(-15) cm2, respectively. The results were compared with those of other experiments.
An experimental study of energy transfer collisions,Cs$(6P_3/2)$+ Cs$(6P_3/2$)+He→Cs(nl_J)+Cs$(6S_1/2$)+He where $nl_J$=$8S_1/2,4F_5/2$ or $4F_7/2$,in the range 330K to 340K,been carried out in a cell.Atoms were excited to the $6P_3/2$ state using a single-mode diode laser.The Cs$(6P_3/2$) atom density and spatial distribution were mapped by monitoring the absorbion of a counterpropagating laser beam.The buffer gas enhanced the energy transfer between two $6P_3/2$,which was based on the measurement of the fluorescence from the $nl_J$ states populated by three-body collision.The three-body collision rate coefficients(in units of 10~-27cm~6$s~-1)$ for 8$S_1/2,4F_5/2$ and $4F_7/2$ are 1.80±0.72,1.28±0.51 and 2.23±0.89,respectively.
An experimental study of energy transfer collisions,Cs(6P3/2)+ Cs(6P3/2)+He→Cs(4FJ)+Cs(6S1/2)+He,in the range 337 K to 357 K,has carried out in a cell.Atoms were excited to the 6P3/2 state using a single-mode diode laser.The Cs(6P3/2) atom density and spatial distribution were mapped by monitoring the absorbion of a counterpropagating laser beam.The buffer gas enhanced the energy transfer between two 6P3/2,which was based on the measurement of the fluorescence from the 4FJ states populated by three-body collision.The three-body collision rate coefficients(in units of 10-27 cm6s-1) for 4F5/2 and 4F7/2 are 1.35±0.18,2.22±0.21,respectively.