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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.

Abstract

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/1367-2630/17/4/045019
Publisher statement:Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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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