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Cold atomic and molecular collisions : approaching the universal loss regime.

Frye, M. D. and Julienne, P. S. and Hutson, J. M. (2015) 'Cold atomic and molecular collisions : approaching the universal loss regime.', New journal of physics., 17 . 045019.


We investigate the behaviour of single-channel theoretical models of cold and ultracold collisions that take account of inelastic and reactive processes using a single parameter to represent short- range loss. We present plots of the resulting energy-dependence of elastic and inelastic or reactive cross sections over the full parameter space of loss parameters and short-range phase shifts. We then test the single-channel model by comparing it with the results of coupled-channel calculations of rotationally inelastic collisions between LiH molecules and Li atoms. We nd that the range of cross sections predicted by the single-channel model becomes increasingly accurate as the initial LiH rotational quantum number increases, with a corresponding increase in the number of open loss channels. The results suggest that coupled-channel calculations at very low energy (in the s-wave regime) could in some cases be used to estimate a loss parameter and then to predict the range of possible loss rates at higher energy, without the need for explicit coupled-channel calculations for higher partial waves.

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Date accepted:No date available
Date deposited:05 May 2015
Date of first online publication:April 2015
Date first made open access:No date available

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