Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session AAA04: V: Spectroscopy and Experiment in Chemical Physics
12:30 PM–2:06 PM,
Wednesday, March 22, 2023
Room: Virtual Room 4
Sponsoring
Unit:
DCP
Chair: Xingjian Wang, University of Alabama in Huntsville
Abstract: AAA04.00002 : Vibrational energy levels and predissociation lifetimes of the A2Σ+ state of SH/SD radicals by photodissociation spectroscopy*
12:42 PM–12:54 PM
Presenter:
Yuan Qin
(University of California, Riverside)
Authors:
Jingsong Zhang
(University of California, Riverside)
Yuan Qin
(University of California, Riverside)
Xianfeng Zheng
(Anhui Normal University)
Yu Song
(Beijing Academy of Quantum Information Sciences)
Ge Sun
(University of California, Riverside)
"Cambria Math",serif;mso-fareast-font-family:DengXian;mso-fareast-theme-font:
minor-fareast;mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US;
mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'>? X2Π bands. The upper A2Σ+ state vibrational levels v' = 5-7 of SH and v' = 3-8 of SD are determined for the first time. The PFY spectra are analyzed with the simulation program PGOPHER [C. M. Western, J. Quant. Spectrosc. Radiat. Transfer, 186, 221 (2016)], which gives vibrational origins and linewidths of the rovibrational levels of the A2Σ+ state. The linewidths (≥ 1.5 cm−1) of the SH A2Σ+ v' = 3-7 and SD A2Σ+ v' = 2-8 states are characterized for the first time in this work, demonstrating that these levels undergo rapid predissociation with lifetimes on the order of picosecond. The lifetimes of the SD A2Σ+ v' = 0, N' = 1 and 2 levels are determined to be 247±50 ns and 176±60 ns by pump-probe delay measurements, respectively. The experimentally measured lifetimes are in a reasonable agreement with the theoretical predictions.
*US National Science Foundation (grant number CHE-1566636 and CHE-2155232)
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