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Title:Characterization Of The A2Σ+ State Of Sh/sd Radicals By Photodissociation Spectroscopy
Author(s):Qin, Yuan
Contributor(s):Zhang, Jingsong; Sun, Ge; Song, Yu; Zheng, Xianfeng
Subject(s):Small molecules
Abstract:Vibrational levels of the A$^{2}\Sigma^{+}$ state of SH ({\it v}$^{\prime}$ = 0-7) and SD ({\it v}$^{\prime}$ = 0-8) radical are investigated via photodissociation using high-{\it n} Rydberg atom time-of-flight technique. By measuring the H-atom product translational energy distributions, contributions from overlapping transitions can be separated, and the H/D-atom photofragment yield (PFY) spectra are obtained across various SH/SD A$^{2}\Sigma^{+}\gets$ X$^{2}\Pi$ rovibrational bands. The upper A$^{2}\Sigma^{+}$ state vibrational levels {\it v}$^{\prime}$ = 5-7 of SH and {\it v}$^{\prime}$ = 3-8 of SD are observed for the first time. Analysis of the PFY spectra using the simulation program PGOPHER\footnote{Western, {\it J. Quant. Spectrosc. Radiat. Transfer}, 186, 221 (2016)} gives vibrational origins along with rovibrational linewidths of the A$^{2}$$\Sigma$$^{+}$ state of SH/SD. The fitted linewidths in the PFY spectra for SH {\it v}$^{\prime}$ = 1-6 and SD {\it v}$^{\prime}$ = 2-6 states are broad ($\ge$ 1.5 cm$^{-1}$), demonstrating that those levels undergo rapid predissociation with lifetimes on the order of picosecond. While the lifetime of SD {\it v}$^{\prime}$ = 0, {\it N}$^{\prime}$= 1 and 2 levels are determined to be 247 $\pm$ 30 ns and 168 $\pm$ 40 ns from pump-probe time delay measurements, respectively. The experimental lifetimes are in reasonable agreement with the theoretical predictions.
Issue Date:2021-06-25
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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