Cold atomic and molecular collisions: approaching the universal loss regime
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 cr...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/4/045019 |
| _version_ | 1797751240646459392 |
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| author | Matthew D Frye Paul S Julienne Jeremy M Hutson |
| author_facet | Matthew D Frye Paul S Julienne Jeremy M Hutson |
| author_sort | Matthew D Frye |
| collection | DOAJ |
| description | 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 find 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. |
| first_indexed | 2024-03-12T16:45:40Z |
| format | Article |
| id | doaj.art-8cf641e0632d4d7eaac93fb3dfcaafb5 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:45:40Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-8cf641e0632d4d7eaac93fb3dfcaafb52023-08-08T14:16:27ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117404501910.1088/1367-2630/17/4/045019Cold atomic and molecular collisions: approaching the universal loss regimeMatthew D Frye0Paul S Julienne1Jeremy M Hutson2Joint Quantum Centre (JQC) Durham-Newcastle, Department of Chemistry, Durham University , South Road, Durham DH1 3LE, UKJoint Quantum Institute, University of Maryland and NIST , College Park, Maryland 20742, USAJoint Quantum Centre (JQC) Durham-Newcastle, Department of Chemistry, Durham University , South Road, Durham DH1 3LE, UKWe 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 find 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.https://doi.org/10.1088/1367-2630/17/4/045019cold atoms and moleculesatomic and molecular collisionsmolecular quantum gases |
| spellingShingle | Matthew D Frye Paul S Julienne Jeremy M Hutson Cold atomic and molecular collisions: approaching the universal loss regime New Journal of Physics cold atoms and molecules atomic and molecular collisions molecular quantum gases |
| title | Cold atomic and molecular collisions: approaching the universal loss regime |
| title_full | Cold atomic and molecular collisions: approaching the universal loss regime |
| title_fullStr | Cold atomic and molecular collisions: approaching the universal loss regime |
| title_full_unstemmed | Cold atomic and molecular collisions: approaching the universal loss regime |
| title_short | Cold atomic and molecular collisions: approaching the universal loss regime |
| title_sort | cold atomic and molecular collisions approaching the universal loss regime |
| topic | cold atoms and molecules atomic and molecular collisions molecular quantum gases |
| url | https://doi.org/10.1088/1367-2630/17/4/045019 |
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