Collisions of Trapped Molecules With Slow Beams

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Collisions of Trapped Molecules With Slow Beams

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Title: Collisions of Trapped Molecules With Slow Beams
Author: Dalgarno, Alexander; Tscherbul, Timur V.; Pavlovic, Zoran; Sadeghpour, Hossein R.; Côté, Robin

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Citation: Tscherbul, Timur V., Zoran Pavlovic, Hossein R. Sadeghpour, Robin Côté, and Alexander Dalgarno. 2010. Collisions of trapped molecules with slow beams. Physical Review A 82(2): 022704.
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Abstract: We present a theoretical study of molecular-trap loss induced by collisions with slow atomic beams based on an explicit analysis of collision kinematics in the laboratory frame and a rigorous quantum description of atom-molecule scattering in external fields. The theory is applied to elucidate the effects of nonuniform magnetic and optical trapping fields on low-temperature collisions of OH \((J=\frac{3}{2},M_J=\frac{3}{2},f)\) molecules with \(^{4}\)He atoms. Our calculations quantify the extent to which both elastic and inelastic cross sections are suppressed by external trapping fields, clarify the role of small-angle scattering in trap loss, and may benefit future experiments on collisional cooling of molecules in electromagnetic traps. The calculated cross sections for trap loss in \(^{4}\)He + OH collisions are consistent with recent experimental observations at low beam energies [ B. C. Sawyer \(et al.\) Phys. Rev. Lett. 101 203203 (2008)], demonstrating the importance of including the effects of nonuniform trapping fields in theoretical simulations of cold collision experiments with trapped molecules and slow atomic beams.
Published Version: doi:10.1103/PhysRevA.82.022704
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