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Physical Review A

Trap loss in a two-species Rb-Cs magneto-optical trap

Gustavo Deczka Telles, Wilton Garcia, Luís Gustavo Marcassa, Vanderlei Salvador Bagnato, D. Ciampini, M. Fazzi, Jörg Helge Müller, David Wilkowski, E. Arimondo

Published Feb 14, 2001• 45 citations
Publisher

Abstract

We investigate inelastic cold collisions in a Rb-Cs mixed-species trap where the rubidium trap loss rate was measured. We present the experimental results and a qualitative discussion for the observation. These studies are relevant for high-resolution atomic and molecular spectroscopy, and for the production of mixed-species Bose-Einstein condensates.

DOI
10.1103/physreva.63.033406

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Physical Review A•Nov 1, 1999•39 citations
We investigate inelastic cold collisions in a Rb-Cs mixed-species trap where the rubidium trap loss rate was measured. We present the experimental results and a qualitative discussion for the observation. These studies are relevant for high-resolution atomic and molecular spectroscopy, and for the production of mixed-species Bose-Einstein condensates.
We generate a bright atomic beam containing laser-cooled rubidium and cesium, and we use this beam to load a mixed-species ultrahigh-vacuum (UHV) magneto-optical trap. We have characterized our two-species atomic beam over a range of operating conditions, and we obtain similar atom fluxes for each species. Within the UHV trap, interspecies inelastic collisions are observed in the form of enhanced decay rates of a given species in the presence of a second trapped species. We analyze the trap decays to obtain a loss rate due to heteronuclear cold collisions, and we compare our result to similar measurements in vapor-cell traps [Phys. Rev. A 63, 033406 (2001)].
We investigate collisional properties of lithium and cesium which are simultaneously confined in a combined magneto-optical trap. Trap-loss collisions between the two species are comprehensively studied. Different inelastic collision channels are identified, and inter-species rate coefficients as well as cross sections are determined. It is found that loss rates are independent of the optical excitation of Li, as a consequence of the repulsive Li∗^*∗-Cs interaction. Li and Cs loss by inelastic inter-species collisions can completely be attributed to processes involving optically excited cesium (fine-structure changing collisions and radiative escape). By lowering the trap depth for Li, an additional loss channel of Li is observed which results from ground-state Li-Cs collisions changing the hyperfine state of cesium.
We realize a combined trap for bosonic chromium (52Cr) and rubidium (87Rb) atoms. Initial experiments focus on exploring a suitable loading scheme for the combined trap and on studies of new trap loss mechanisms originating from simultaneous trapping of two species. By comparing the trap loss from the 87Rb magneto-optical trap (MOT) in the absence and presence of magnetically trapped ground state 52Cr atoms we determine the scattering cross-section of σ inel,RbCr = 5.0 ± 4.0 × 10−18 m2 for light-induced inelastic collisions between the two species. Studying the trap loss from the Rb magneto-optical trap induced by the Cr cooling-laser light, the photoionization cross-section of the excited 5P3/1 state at an ionizing wavelength of 426 nm is measured to be σ P = 1.1 ± 0.3 × 10−21 m2.