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Title:BARELY FLUORESCENT MOLECULES I. TWIN DISCHARGE JET SPECTROSCOPY OF HSnCl
Author(s):Smith, Tony
Contributor(s):Tarroni, Riccardo ; Clouthier, Dennis ; Rothschopf, Gretchen K
Subject(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.
Issue Date:23-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107689
Date Available in IDEALS:2020-06-26


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