Photoassociative Spectroscopy and Formation of Cold Molecules in Cold Cesium Vapor: Trap–Loss Spectrum versus Ion Spectrum
✍ Scribed by D. Comparat; C. Drag; A. Fioretti; O. Dulieu; P. Pillet
- Book ID
- 102598644
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 106 KB
- Volume
- 195
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
We report on the experimental spectra of all the optically accessible long-range attractive molecular states of the Cs 2 dimer below the 6s 2 S 1/ 2 ϩ 6p 2 P 3/ 2 dissociation limit by molecular photoassociation of cold Cs atoms. The spectra are obtained by the usual trap-loss method as well as by pulsed-laser photoionization of Cs 2 molecules into Cs 2 ϩ ions. The two spectra present markedly different features. While the 1 g , 0 u ϩ , and 0 g Ϫ vibrational progressions are present in the trap-loss spectrum, the Cs 2 ϩ ion spectrum presents only the 0 g Ϫ and 1 u vibrational progressions. Those states (0 g Ϫ and 1 u ) lead to the formation of the translationally cold Cs 2 ground state molecules at temperatures in the 100 K range, to our knowledge the lowest molecular temperature reported up until now. The C 3 asymptotic coefficients for the 0 u ϩ and 1 g states are determined through a fit of the experimental energy levels.