Inelastic collisions of CaH with He at cryogenic temperatures
Using helium buffer gas cooling, we have prepared dense samples of ground-state molecular calcium monohydride (CaH X 2Σ) at cryogenic temperatures. We have used optical pumping to polarise the spin state of the CaH molecules and we have measured the inelastic collisions of molecular CaH with atomic...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Taylor & Francis Ltd.
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/29030 |
| _version_ | 1848752694052782080 |
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| author | Singh, V. Hardman, K. Lu, M. Ellis, Aja Morrison, M. Weinstein, J. |
| author_facet | Singh, V. Hardman, K. Lu, M. Ellis, Aja Morrison, M. Weinstein, J. |
| author_sort | Singh, V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Using helium buffer gas cooling, we have prepared dense samples of ground-state molecular calcium monohydride (CaH X 2Σ) at cryogenic temperatures. We have used optical pumping to polarise the spin state of the CaH molecules and we have measured the inelastic collisions of molecular CaH with atomic helium at temperatures from 2 to 7 K. The measured CaH electronic spin depolarisation rate coefficient increases rapidly with increasing temperature, increasing from 2 × 10−13 cm3 s−1 to over 10−11 cm3 s−1. The strong dependence of rate coefficient on temperature is attributed to the CaH population in the first excited rotational state. |
| first_indexed | 2025-11-14T08:12:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-29030 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:12:41Z |
| publishDate | 2013 |
| publisher | Taylor & Francis Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-290302019-02-19T04:28:02Z Inelastic collisions of CaH with He at cryogenic temperatures Singh, V. Hardman, K. Lu, M. Ellis, Aja Morrison, M. Weinstein, J. Using helium buffer gas cooling, we have prepared dense samples of ground-state molecular calcium monohydride (CaH X 2Σ) at cryogenic temperatures. We have used optical pumping to polarise the spin state of the CaH molecules and we have measured the inelastic collisions of molecular CaH with atomic helium at temperatures from 2 to 7 K. The measured CaH electronic spin depolarisation rate coefficient increases rapidly with increasing temperature, increasing from 2 × 10−13 cm3 s−1 to over 10−11 cm3 s−1. The strong dependence of rate coefficient on temperature is attributed to the CaH population in the first excited rotational state. 2013 Journal Article http://hdl.handle.net/20.500.11937/29030 10.1080/00268976.2013.772668 Taylor & Francis Ltd. fulltext |
| spellingShingle | Singh, V. Hardman, K. Lu, M. Ellis, Aja Morrison, M. Weinstein, J. Inelastic collisions of CaH with He at cryogenic temperatures |
| title | Inelastic collisions of CaH with He at cryogenic temperatures |
| title_full | Inelastic collisions of CaH with He at cryogenic temperatures |
| title_fullStr | Inelastic collisions of CaH with He at cryogenic temperatures |
| title_full_unstemmed | Inelastic collisions of CaH with He at cryogenic temperatures |
| title_short | Inelastic collisions of CaH with He at cryogenic temperatures |
| title_sort | inelastic collisions of cah with he at cryogenic temperatures |
| url | http://hdl.handle.net/20.500.11937/29030 |