Barely fluorescent molecules i. Twin discharge jet spectroscopy of hsncl

Smith, Tony

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https://hdl.handle.net/2142/107689 Copy

Description

Title

Barely fluorescent molecules i. Twin discharge jet spectroscopy of hsncl

Author(s)

Smith, Tony

Contributor(s)

• Tarroni, Riccardo
• Clouthier, Dennis
• Rothschopf, Gretchen K.

Issue Date

2020-06-23

Keyword(s)

Small molecules

Abstract

The divalent tin HSnCl transient molecule has been detected for the first time by LIF spectroscopy. HSnCl and DSnCl were produced in a twin discharge jet using separate precursor streams of SnH$_{4}$ and HCl (DCl), both diluted in high pressure argon. The \~{A}$^{1}$A$''$-\~{X}$^{1}$A$'$ spectrum of HSnCl consists of a single rotationally resolved 0-0 band with a very short fluorescence lifetime ($\sim$25 ns). In contrast, the spectrum of DSnCl exhibits three bands (0$_{0}^{\,0}$, 2$_{0}^{\,1}$ and 2$_{0}^{\,2}$) whose fluorescence lifetimes decrease from 400 ns (0$^{0}$) to less than 10 ns (2$^{2}$). Single vibronic level emission spectra have been recorded, providing information on all three vibrational modes in the ground state. Fluorescence hole burning experiments have shown that a few higher nonfluorescent levels are very short-lived but still detectable. Our detailed ab initio studies indicate that these molecules dissociate into SnCl + H on the excited state potential surface and this is the cause of the short fluorescence lifetimes and breaking off of the fluorescence. It is fortunate that the HSnCl excited state zero-point level is still fluorescent or it would not be detectable by LIF spectroscopy. Our calculations also predict that HSnBr should also fluoresce on excitation of low-lying bending levels in the excited state.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

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http://hdl.handle.net/2142/107689

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Copyright 2020 is held by the Author(s)

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