Experimental investigation of ultracold atom-molecule collisions

Abstract

Ultracold collisions between Cs atoms and Cs2 dimers in the electronic ground state are observed in an optically trapped gas of atoms and molecules. The Cs2 molecules are formed in the triplet ground state by cw-photoassociation through the outer well of the 0g-(P3/2) excited electronic state. Inelastic atom-molecule collisions converting internal excitation into kinetic energy lead to a loss of Cs2 molecules from the dipole trap. Rate coefficients are determined for collisions involving Cs atoms in either the F=3 or F=4 hyperfine ground state and Cs2 molecules in either highly vibrationally excited states (v'=32-47) or in low vibrational states (v'=4-6) of the a ^3 Sigma_u^+ triplet ground state. The rate coefficients beta ~10^{-10} cm^3/s are found to be largely independent of the vibrational and rotational excitation indicating unitary limited cross sections.

4 pages, 3 figures, submitted for publication

References in corpus (9)

• Optical Production of Ultracold Polar Molecules
• Observation of Feshbach-like resonances in collisions between ultracold molecules
• Sympathetic Cooling with Two Atomic Species in an Optical Trap
• Dissociation and Decay of Ultra-cold Sodium Molecules
• Atom-molecule collisions in an optically trapped gas
• Direct measurement of the radiative lifetime of vibrationally excited OH radicals
• Ultracold Li + Li_2 collisions: bosonic and fermionic cases
• Ultracold quantum dynamics: spin-polarized K + K_2 collisions with three identical bosons or fermions
• Photoassociation inside an optical dipole trap: absolute rate coefficients and Franck-Condon factors

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