Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session Q07: Cold and Ultracold Molecules II
8:00 AM–10:00 AM,
Thursday, June 8, 2023
Room: 206 B
Chair: David Hvizdos, Purdue University
Abstract: Q07.00008 : Laser spectroscopy of aromatic molecules with optical cycling centers: strontium (I) phenoxides*
9:24 AM–9:36 AM
Presenter:
Guanming Lao
(University of California, Los Angeles)
Authors:
Guanming Lao
(University of California, Los Angeles)
Guo-Zhu Zhu
(University of California, Los Angeles)
Claire Dickerson
(University of California, Los Angeles)
Benjamin Augenbraun
(Harvard University)
Anastassia Alexandrova
(UCLA)
Justin R Caram
(California State University, Los Angeles)
Eric R Hudson
(UCLA)
Wesley C Campbell
(University of California, Los Angeles)
Collaboration:
Here, we report the production and spectroscopic characterization of strontium (I) phenoxide (SrOC6H5, or SrOPh) and variants featuring electron-withdrawing groups designed to suppress vibrational excitation during spontaneous emission from the electronically excited state. By using dispersed laser-induced fluorescence spectroscopy, we discovered that the cycling closure of these species, which is the decoupling of vibrational state changes from spontaneous optical decay, is high, which is consistent with theoretical predictions. A high-resolution, rotationally resolved laser excitation spectrum is also recorded for SrOPh, allowing the estimation of spectroscopic constants and identification of candidate optical cycling transitions for future work.
The results show the promise of strontium phenoxides for laser cooling and quantum state detection at the single-molecule level. This work also suggests that a larger class of molecules than previously realized may be amenable to laser cooling.
*This work was supported by the AFOSR (grant no. FA9550-20-1-0323), the NSF (grant no. OMA-2016245, PHY-2207985 and DGE-2034835), NSF Center for Chemical Innovation Phase I (grant no. CHE-20223563). This research is funded in part by the Gordon and Betty Moore Foundation.
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