Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping
Alkaline earth monoalkoxide free radicals (MORs) have molecular properties conducive to direct laser cooling to sub-millikelvin temperatures. Using dispersed laser induced fluorescence measurements from a pulsed supersonic molecular beam source we determine vibrational branching ratios and Franck–Co...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ab19d7 |
| _version_ | 1797750170866155520 |
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| author | Ivan Kozyryev Timothy C Steimle Phelan Yu Duc-Trung Nguyen John M Doyle |
| author_facet | Ivan Kozyryev Timothy C Steimle Phelan Yu Duc-Trung Nguyen John M Doyle |
| author_sort | Ivan Kozyryev |
| collection | DOAJ |
| description | Alkaline earth monoalkoxide free radicals (MORs) have molecular properties conducive to direct laser cooling to sub-millikelvin temperatures. Using dispersed laser induced fluorescence measurements from a pulsed supersonic molecular beam source we determine vibrational branching ratios and Franck–Condon factors for the MORs CaOH and CaOCH _3 . With narrow linewidth continuous-wave dye laser excitation, we precisely measure fluorescence branching for both $\tilde{X}\mbox{--}\tilde{A}$ and $\tilde{X}\mbox{--}\tilde{B}$ electronic systems in each molecule. Weak symmetry-forbidden decays to excited bending states with non-zero vibrational angular momentum are observed. Normal mode theoretical analysis combined with ab initio structural calculations are performed and compared to experimental results. Our measurements and analysis pave the way for direct laser cooling of these (and other) complex nonlinear polyatomic molecules. We also describe a possible approach to laser cooling and trapping of molecules with fewer symmetries like chiral species. |
| first_indexed | 2024-03-12T16:28:51Z |
| format | Article |
| id | doaj.art-d19ea82e5deb43e090e080854b761cc4 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:28:51Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-d19ea82e5deb43e090e080854b761cc42023-08-08T15:36:10ZengIOP PublishingNew Journal of Physics1367-26302019-01-0121505200210.1088/1367-2630/ab19d7Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trappingIvan Kozyryev0https://orcid.org/0000-0001-5119-6478Timothy C Steimle1Phelan Yu2Duc-Trung Nguyen3John M Doyle4Harvard-MIT Center for Ultracold Atoms, Cambridge, MA 02138, United States of America; Department of Physics, Harvard University , Cambridge, MA 02138, United States of AmericaSchool of Molecular Sciences, Arizona State University , Tempe, AZ 85287, United States of AmericaHarvard-MIT Center for Ultracold Atoms, Cambridge, MA 02138, United States of America; Department of Physics, Harvard University , Cambridge, MA 02138, United States of AmericaSchool of Molecular Sciences, Arizona State University , Tempe, AZ 85287, United States of AmericaHarvard-MIT Center for Ultracold Atoms, Cambridge, MA 02138, United States of America; Department of Physics, Harvard University , Cambridge, MA 02138, United States of AmericaAlkaline earth monoalkoxide free radicals (MORs) have molecular properties conducive to direct laser cooling to sub-millikelvin temperatures. Using dispersed laser induced fluorescence measurements from a pulsed supersonic molecular beam source we determine vibrational branching ratios and Franck–Condon factors for the MORs CaOH and CaOCH _3 . With narrow linewidth continuous-wave dye laser excitation, we precisely measure fluorescence branching for both $\tilde{X}\mbox{--}\tilde{A}$ and $\tilde{X}\mbox{--}\tilde{B}$ electronic systems in each molecule. Weak symmetry-forbidden decays to excited bending states with non-zero vibrational angular momentum are observed. Normal mode theoretical analysis combined with ab initio structural calculations are performed and compared to experimental results. Our measurements and analysis pave the way for direct laser cooling of these (and other) complex nonlinear polyatomic molecules. We also describe a possible approach to laser cooling and trapping of molecules with fewer symmetries like chiral species.https://doi.org/10.1088/1367-2630/ab19d7laser coolingpolyatomic moleculesmultidimensional Franck–Condon factorsdispersed laser-induced fluorescence |
| spellingShingle | Ivan Kozyryev Timothy C Steimle Phelan Yu Duc-Trung Nguyen John M Doyle Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping New Journal of Physics laser cooling polyatomic molecules multidimensional Franck–Condon factors dispersed laser-induced fluorescence |
| title | Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping |
| title_full | Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping |
| title_fullStr | Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping |
| title_full_unstemmed | Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping |
| title_short | Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping |
| title_sort | determination of caoh and caoch3 vibrational branching ratios for direct laser cooling and trapping |
| topic | laser cooling polyatomic molecules multidimensional Franck–Condon factors dispersed laser-induced fluorescence |
| url | https://doi.org/10.1088/1367-2630/ab19d7 |
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