Prospects for laser cooling of polyatomic molecules with increasing complexity
Optical cycling transitions and direct laser cooling have recently been demonstrated for a number of alkaline-earth dimers and trimer molecules. This is made possible by diagonal Franck-Condon factors between the vibrational modes of the optical transition. Achieving a similar degree of cooling to m...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-03-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.013384 |
| _version_ | 1797211510918873088 |
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| author | Jacek Kłos Svetlana Kotochigova |
| author_facet | Jacek Kłos Svetlana Kotochigova |
| author_sort | Jacek Kłos |
| collection | DOAJ |
| description | Optical cycling transitions and direct laser cooling have recently been demonstrated for a number of alkaline-earth dimers and trimer molecules. This is made possible by diagonal Franck-Condon factors between the vibrational modes of the optical transition. Achieving a similar degree of cooling to microkelvin equivalent kinetic energy for larger polyatomic molecules, however, remains challenging. Since polyatomic molecules are characterized by multiple degrees of freedom and have a correspondingly more complex structure, it is far from obvious whether there exist polyatomic molecules that can repeatedly scatter photons. Here, we propose chemical substitution approaches to engineer large polyatomic molecules with optical cycling centers (OCCs) containing alkaline-earth oxide dimers or acetylenic alkaline-earth trimers (i.e., M−C≡C) connected to (CH)_{n} chains or fullerenes. To validate the OCC-character of the selected molecules, we performed electronic structure calculations of the equilibrium configuration of both ground and excited potential energy surfaces, evaluated their vibrational and bending modes, and corresponding Franck-Condon factors for all but the most complex molecules. For fullerenes, we have shown that OCCs based on M−C≡C can perform better than those based on alkaline-earth oxide dimers. In addition, for heavier polyatomic molecules it might be advantageous to attach two OCCs, thereby potentially doubling the photon scattering rate and thus speeding up cooling rates. |
| first_indexed | 2024-04-24T10:27:39Z |
| format | Article |
| id | doaj.art-fe6399b1f7ce4420bd68330e7b45c240 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:27:39Z |
| publishDate | 2020-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-fe6399b1f7ce4420bd68330e7b45c2402024-04-12T16:52:14ZengAmerican Physical SocietyPhysical Review Research2643-15642020-03-012101338410.1103/PhysRevResearch.2.013384Prospects for laser cooling of polyatomic molecules with increasing complexityJacek KłosSvetlana KotochigovaOptical cycling transitions and direct laser cooling have recently been demonstrated for a number of alkaline-earth dimers and trimer molecules. This is made possible by diagonal Franck-Condon factors between the vibrational modes of the optical transition. Achieving a similar degree of cooling to microkelvin equivalent kinetic energy for larger polyatomic molecules, however, remains challenging. Since polyatomic molecules are characterized by multiple degrees of freedom and have a correspondingly more complex structure, it is far from obvious whether there exist polyatomic molecules that can repeatedly scatter photons. Here, we propose chemical substitution approaches to engineer large polyatomic molecules with optical cycling centers (OCCs) containing alkaline-earth oxide dimers or acetylenic alkaline-earth trimers (i.e., M−C≡C) connected to (CH)_{n} chains or fullerenes. To validate the OCC-character of the selected molecules, we performed electronic structure calculations of the equilibrium configuration of both ground and excited potential energy surfaces, evaluated their vibrational and bending modes, and corresponding Franck-Condon factors for all but the most complex molecules. For fullerenes, we have shown that OCCs based on M−C≡C can perform better than those based on alkaline-earth oxide dimers. In addition, for heavier polyatomic molecules it might be advantageous to attach two OCCs, thereby potentially doubling the photon scattering rate and thus speeding up cooling rates.http://doi.org/10.1103/PhysRevResearch.2.013384 |
| spellingShingle | Jacek Kłos Svetlana Kotochigova Prospects for laser cooling of polyatomic molecules with increasing complexity Physical Review Research |
| title | Prospects for laser cooling of polyatomic molecules with increasing complexity |
| title_full | Prospects for laser cooling of polyatomic molecules with increasing complexity |
| title_fullStr | Prospects for laser cooling of polyatomic molecules with increasing complexity |
| title_full_unstemmed | Prospects for laser cooling of polyatomic molecules with increasing complexity |
| title_short | Prospects for laser cooling of polyatomic molecules with increasing complexity |
| title_sort | prospects for laser cooling of polyatomic molecules with increasing complexity |
| url | http://doi.org/10.1103/PhysRevResearch.2.013384 |
| work_keys_str_mv | AT jacekkłos prospectsforlasercoolingofpolyatomicmoleculeswithincreasingcomplexity AT svetlanakotochigova prospectsforlasercoolingofpolyatomicmoleculeswithincreasingcomplexity |