Spectroscopy And Predissociation Dynamics Of Sh Radicals Via The A2ς+ State

Qin, Yuan

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https://hdl.handle.net/2142/116761 Copy

Description

Title

Spectroscopy And Predissociation Dynamics Of Sh Radicals Via The A2ς+ State

Author(s)

Qin, Yuan

Contributor(s)

• Zhang, Jingsong
• Sun, Ge
• Song, Yu
• Zheng, Xianfeng

Issue Date

2022-06-22

Keyword(s)

Mini-symposium: Spectroscopy meets Chemical Dynamics

Abstract

The spectroscopy and predissociation dynamics of several vibronic levels (\textit{v}$^{\prime}$ = 0-6) of the SH A$^{2}$$\Sigma$$^{+}$ state have been studied using the high-\textit{n} Rydberg atom time-of-flight (HRTOF) technique. By measuring the product translational energy distributions as a function of excitation wavelength, the H + S($^{3}$P$_{J}$) photofragment yield (PFY) spectra are obtained across the various A$^{2}$$\Sigma$$^{+}$ $\leftarrow$ X$^{2}$$\Pi$ bands. The PFY spectra of the A$^{2}$$\Sigma$$^{+}$ \textit{v}$^{\prime}$ = 3-6 states exhibit broad linewidths ($>$ 4 \wn), indicating that these levels undergo rapid predissociation with lifetimes on the order of picosecond. The measured spin-orbit branching fractions of the H + S($^{3}$P$_{J=2,1,0}$) product channels provide insights to the predissociation dynamics of the A$^{2}$$\Sigma$$^{+}$ state, which change dramatically as the vibrational level \textit{v}$^{\prime}$ increases. The A$^{2}$$\Sigma$$^{+}$ \textit{v}$^{\prime}$ $=$ 0 state of SH predissociates mainly through adiabatic coupling to the $^{4}$$\Sigma$$^{-}$ repulsive state, while all three repulsive states ($^{4}$$\Sigma$$^{-}$, $^{2}$$\Sigma$$^{-}$, and $^{4}$$\Pi$) are involved in the dissociation pathways for higher vibrational levels.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116761

DOI

https://doi.org/10.15278/isms.2022.WH10

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Copyright 2022 held by the authors

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