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The European Physical Journal D

The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold $\mathsf{^{39}K^{85}Rb}$

Dajun Wang, J. Qi, M. F. Stone, О. Nikolayeva, Brian C. Hattaway, S. D. Gensemer, Haijin Wang, Warren T. Zemke, P. L. Gould, Edward E. Eyler, William C. Stwalley

Published Nov 1, 2004• 90 citations
Publisher
DOI
10.1140/epjd/e2004-00162-7

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The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold 39K85Rb\mathsf{^{39}K^{85}Rb}39K85Rb
We report the production of ultracold 7 Li 85 Rb molecules by photoassociation (PA) below the Li (2 s 2 S 1/2 ) + Rb(5 p 2 P 1/2 ) asymptote. We perform PA spectroscopy in a dual-species 7 Li- 85 Rb magneto-optical trap (MOT) and detect the PA resonances using trap loss spectroscopy. We observe several strong PA resonances corresponding to the last few bound states, assign the lines and derive the long-range C 6 dispersion coefficients for the Li (2 s 2 S 1/2 ) + Rb(5 p 2 P 1/2 ) asymptote. We also report an excited-state molecule formation rate of and a PA rate coefficient of , which are both among the highest observed for heteronuclear bi-alkali molecules. These suggest that PA is a promising route for the creation of ultracold ground-state LiRb molecules.
Photoassociation and ionization spectroscopy of ultracold 7^{7}7Li-85^{85}85Rb molecules
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Summary form only given. In contrast to atoms, laser cooling of molecules is very difficult because of the lack of a closed two-level scheme for recycling the population. The molecular photoassociation of cold atoms opens a promising alternative for the formation of cold molecules. The photoassociative spectra are obtained by the usual trap-loss method as well as by pulsed laser photoionization of Cs/sub 2/ molecules into Cs/sub 2//sup +/ ions. Different schemes to obtain formation of cold molecules through photoassociation will be discussed.
We have produced ultracold heteronuclear ${\text{YbRb}}^{\ensuremath{\ast}}$ molecules in a combined magneto-optical trap by photoassociation. The formation of electronically excited molecules close to the dissociation limit was observed by the trap loss spectroscopy in mixtures of 87Rb^{87}\text{R}\text{b}87Rb with 174Yb^{174}\text{Y}\text{b}174Yb and 176Yb^{176}\text{Y}\text{b}176Yb. The molecules could be prepared in well-defined rovibrational levels, allowing for an experimental determination of the long-range potential in the electronically excited state.