Hyperfine structure of the $\mathbf{A^{1}Π}$ state of AlCl and its relevance to laser cooling and trapping
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866912009393537024 |
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| author | Daniel, J. R. Shaw, J. C. Wang, C. Liu, L. -R. Kendrick, B. K. Hemmerling, B. McCarron, D. J. |
| author_facet | Daniel, J. R. Shaw, J. C. Wang, C. Liu, L. -R. Kendrick, B. K. Hemmerling, B. McCarron, D. J. |
| contents | The majority of molecules proposed for laser cooling and trapping experiments have $Σ$-type ground states. Specifically, $^2Σ$ states have cycling transitions analogous to D1-lines in alkali-metal atoms while $^1Σ$ states offer both strong and weak cycling transitions analogous to those in alkaline-earth atoms. Despite this proposed variety, to date, only molecules with $^2Σ$-type ground states have successfully been confined and cooled in magneto-optical traps. While none of the proposed $^1Σ$-type molecules have been successfully laser cooled and trapped, they are expected to have various advantages in terms of exhibiting a lower chemical reactivity and an internal structure that benefits the cooling schemes. Here, we present the prospects and strategies for optical cycling in AlCl -- a $^1Σ$ molecule -- and report on the characterization of the $A^{1}Π$ state hyperfine structure. Based on these results, we carry out detailed simulations on the expected capture velocity of a magneto-optical trap for AlCl. Finally, using {\it ab initio} calculations, we identify the photodissociation via a $3^1Π$ state and photoionization process via the $3^1Σ^+$ state as possible loss mechanisms for a magneto-optical trap of AlCl. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_16835 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Hyperfine structure of the $\mathbf{A^{1}Π}$ state of AlCl and its relevance to laser cooling and trapping Daniel, J. R. Shaw, J. C. Wang, C. Liu, L. -R. Kendrick, B. K. Hemmerling, B. McCarron, D. J. Atomic Physics The majority of molecules proposed for laser cooling and trapping experiments have $Σ$-type ground states. Specifically, $^2Σ$ states have cycling transitions analogous to D1-lines in alkali-metal atoms while $^1Σ$ states offer both strong and weak cycling transitions analogous to those in alkaline-earth atoms. Despite this proposed variety, to date, only molecules with $^2Σ$-type ground states have successfully been confined and cooled in magneto-optical traps. While none of the proposed $^1Σ$-type molecules have been successfully laser cooled and trapped, they are expected to have various advantages in terms of exhibiting a lower chemical reactivity and an internal structure that benefits the cooling schemes. Here, we present the prospects and strategies for optical cycling in AlCl -- a $^1Σ$ molecule -- and report on the characterization of the $A^{1}Π$ state hyperfine structure. Based on these results, we carry out detailed simulations on the expected capture velocity of a magneto-optical trap for AlCl. Finally, using {\it ab initio} calculations, we identify the photodissociation via a $3^1Π$ state and photoionization process via the $3^1Σ^+$ state as possible loss mechanisms for a magneto-optical trap of AlCl. |
| title | Hyperfine structure of the $\mathbf{A^{1}Π}$ state of AlCl and its relevance to laser cooling and trapping |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2309.16835 |