Photoassociative Spectroscopy and Formation of Cold Molecules in Cold Cesium Vapor: Trap-Loss Spectrum versus Ion Spectrum

Year: 1999

Authors: Comparat D., Drag C., Fioretti A., Dulieu O., Pillet P.

Autors Affiliation: Laboratoire Aimé Cotton, CNRS II, Campus d\’Orsay, 91405 Orsay Cedex, France

Abstract: We report on the experimental spectra of all the optically accessible long-range attractive molecular states of the Cs, dimer below the 6s(2)S(1/2) + 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 Ca, molecules into Cs: ions. The two spectra present markedly different features. While the 1(g), 0(u)(+), and 0(g)(-) vibrational progressions are present in the trap-loss spectrum, the Cs-2(+) ion spectrum presents only the 0(g)(-) and 1(u) vibrational progressions. Those states (0(g)(-) and 1(u)) lead to the formation of the translationally cold Cs-2 ground state molecules at temperatures in the 100 mu K range, to our knowledge the lowest molecular temperature reported up until now. The C-3 asymptotic coefficients for the 0(u)(+) and 1(g) states are determined through a fit of the experimental energy levels

Journal/Review: JOURNAL OF MOLECULAR SPECTROSCOPY

Volume: 195 (2)      Pages from: 229  to: 235

More Information: Conference: 53rd OSU International Symposium on Molecular Spectroscopy
Location: COLUMBUS, OHIO – Date: JUN 18, 1998
KeyWords: Cold molecules; Collisions of cold atoms; High-resolution laser spectroscopy; Long-range molecules; Spectroscopy of dimer molecules
DOI: 10.1006/jmsp.1999.7764

Citations: 53
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