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Cold atomic and molecular collisions: approaching the universal loss regime | | Matthew D. Frye
; Paul S. Julienne
; Jeremy M. Hutson
; | | Date: |
16 Dec 2014 | | 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 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 find that 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
an explicit partial-wave sum. | | Source: | arXiv, 1412.5114 | | Services: | Forum | Review | PDF | Favorites | |
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