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Quantum Electronics and Laser Science Conference

Exoergic cold collisions in a mixture of K-Rb

Gustavo Deczka Telles, Sérgio Ricardo Muniz, Vanderlei Salvador Bagnato, Luís Gustavo Marcassa

Published Jan 1, 2000• 0 citations
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Abstract

Summary form only given. Several theoretical studies have recently been published, proposing a new series of experiments involving two different species of atoms trapped together: two species BEC and heteronuclear cold collisions. As in the case of single species, these experiments require that samples be obtained at high density. Therefore, an important step is the understanding and possible control of heteronuclear collisions. In this context, the study of trap loss in a binary mixture comes at the right time and is significant. We report on a measurement of cross species trap loss rate for a system composed of /sup 39/K and /sup 85/Rb, and we implement an adapted Gallagher-Pritchard model to attempt to explain the experimental observations.

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Summary form only given. Several theoretical studies have recently been published, proposing a new series of experiments involving two different species of atoms trapped together: two species BEC and heteronuclear cold collisions. As in the case of single species, these experiments require that samples be obtained at high density. Therefore, an important step is the understanding and possible control of heteronuclear collisions. In this context, the study of trap loss in a binary mixture comes at the right time and is significant. We report on a measurement of cross species trap loss rate for a system composed of /sup 39/K and /sup 85/Rb, and we implement an adapted Gallagher-Pritchard model to attempt to explain the experimental observations.
We have observed a heteronuclear trap loss rate for a mixture of trapped 39K{}^{39}\mathrm{K}39K and 85Rb{}^{85}\mathrm{Rb}85Rb atoms. Our results indicate that hyperfine changing collision and radiative escape dominate in the low and high intensity regimes, respectively. They are also consistent with radiative escape taking place with the participation of the doubly excited state potential $({\mathrm{K}}^{*}\ensuremath{-}{\mathrm{Rb}}^{*}).$ A Gallagher-Pritchard model taking into account the doubly excited channel was implemented, reproducing the experimental results well qualitatively. The values obtained for the cross species trap loss indicate possibilities of future experiments with this mixture.
Summary form only given. We present a set of experimental results of trap loss rate for the following mixtures: Na-Rb, K-Rb, Na-K, Rb-Cs and Cs-K. The analysis of our data set allows us to conclude that radiative escape is the main loss mechanism and we observed the significant contribution of the double-excited potential (both atoms excited) for the losses on the studied species. We also have applied an adapted Gallagher-Pritchard model to understand the importance of the reduced mass and the trap depth.
Summary form only given. All the experiments and theories describing atomic traps and cold collisions have considered only homonuclear systems. Cold collisions involving different atomic species open up new and exciting possibilities, including high-resolution studies of heteronuclear molecular band formation. We have carried out an experiment on the simultaneous magneto-optical trapping of two alkali atoms: Na and K. Collisional rate constant of trap loss resulting from cross atomic collisions was investigated through the transient loading of the trap.
We have realized a two-species mirror-magneto-optical trap containing a mixture of 87Rb(85Rb)^{87}\mathrm{Rb}\phantom{\rule{0.3em}{0ex}}(^{85}\mathrm{Rb})87Rb(85Rb) and 133Cs^{133}\mathrm{Cs}133Cs atoms. Using this trap, we have measured the heteronuclear collisional loss rate ${\ensuremath{\beta}}_{\mathrm{Rb-Cs}}^{\ensuremath{'}}$ due to intraspecies cold collisions. We find a distinct difference in the magnitude and intensity dependence of ${\ensuremath{\beta}}_{\text{Rb-Cs}}^{\ensuremath{'}}$ for the two isotopes 87Rb^{87}\mathrm{Rb}87Rb and 85Rb^{85}\mathrm{Rb}85Rb which we attribute to the different ground-state hyperfine splitting energies of the two isotopes.
Summary form only given. Inelastic collisions between cold atoms can lead to their ejection from the laser trap that confines them. Understanding these trap loss collisions is important to efforts aimed at high densities of cold atoms. Previously we have observed pronounced differences in the collisional behavior of the two isotopes, /sup 85/Rb and /sup 87/Rb, for the trap laser tuned one natural linewidth below resonance. We have extended our measurements for both isotopes to smaller and larger detunings in an effort to separate the various contributions to the trap loss rate.