Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell
A direct simulation Monte Carlo (DSMC) method is applied to model collisions between He buffer gas atoms and ammonia molecules within a buffer gas cell. State-tostate cross sections, calculated as a function of collision energy, enable the inelastic collisions between He and NH3 to be considered exp...
| Main Authors: | , , , , , , , |
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| Format: | Journal article |
| Published: |
AIP Publishing
2017
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| _version_ | 1826295237391155200 |
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| author | Doppelbauer, M Schullian, O Loreau, J Vaeck, N van der Avoird, A Rennick, C Softley, T Heazlewood, B |
| author_facet | Doppelbauer, M Schullian, O Loreau, J Vaeck, N van der Avoird, A Rennick, C Softley, T Heazlewood, B |
| author_sort | Doppelbauer, M |
| collection | OXFORD |
| description | A direct simulation Monte Carlo (DSMC) method is applied to model collisions between He buffer gas atoms and ammonia molecules within a buffer gas cell. State-tostate cross sections, calculated as a function of collision energy, enable the inelastic collisions between He and NH3 to be considered explicitly. The inclusion of rotationalstate-changing collisions affects the translational temperature of the beam, indicating that elastic and inelastic processes should not be considered in isolation. The properties of the cold molecular beam exiting the cell are examined as a function of the cell parameters and operating conditions; the rotational and translational energy distributions and are in accord with experimental measurements. The DSMC calculations show that thermalisation occurs well within the typical 10-20 mm length of many buffer gas cells, suggesting that shorter cells could be employed in many instances – yielding a higher flux of cold molecules. |
| first_indexed | 2024-03-07T03:57:57Z |
| format | Journal article |
| id | oxford-uuid:c3828d94-378f-4b5f-bfde-8e2e0292191c |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:57:57Z |
| publishDate | 2017 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:c3828d94-378f-4b5f-bfde-8e2e0292191c2022-03-27T06:17:07ZUsing a direct simulation Monte Carlo approach to model collisions in a buffer gas cellJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c3828d94-378f-4b5f-bfde-8e2e0292191cSymplectic Elements at OxfordAIP Publishing2017Doppelbauer, MSchullian, OLoreau, JVaeck, Nvan der Avoird, ARennick, CSoftley, THeazlewood, BA direct simulation Monte Carlo (DSMC) method is applied to model collisions between He buffer gas atoms and ammonia molecules within a buffer gas cell. State-tostate cross sections, calculated as a function of collision energy, enable the inelastic collisions between He and NH3 to be considered explicitly. The inclusion of rotationalstate-changing collisions affects the translational temperature of the beam, indicating that elastic and inelastic processes should not be considered in isolation. The properties of the cold molecular beam exiting the cell are examined as a function of the cell parameters and operating conditions; the rotational and translational energy distributions and are in accord with experimental measurements. The DSMC calculations show that thermalisation occurs well within the typical 10-20 mm length of many buffer gas cells, suggesting that shorter cells could be employed in many instances – yielding a higher flux of cold molecules. |
| spellingShingle | Doppelbauer, M Schullian, O Loreau, J Vaeck, N van der Avoird, A Rennick, C Softley, T Heazlewood, B Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title | Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title_full | Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title_fullStr | Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title_full_unstemmed | Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title_short | Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell |
| title_sort | using a direct simulation monte carlo approach to model collisions in a buffer gas cell |
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