University of Illinois Urbana-Champaign

Ir Induced Isomerization And Its Backward Reaction Of Cold Phenol-methanol Cluster Cations

Ishikawa, Haruki

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WA09_1.pptx
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https://hdl.handle.net/2142/116506

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Title
Ir Induced Isomerization And Its Backward Reaction Of Cold Phenol-methanol Cluster Cations
Author(s)
Ishikawa, Haruki
Contributor(s)
  • Mizuse, Kenta
  • Sato, Hikaru
  • Orito, Masataka
  • Ozeki, Masayoshi
Issue Date
2022-06-22
Keyword(s)
Mini-symposium: Spectroscopy meets Chemical Dynamics
Abstract
Since gas-phase hydrogen-bonded clusters are treated as a microscopic model of hydrogen bond networks, a huge number of spectroscopic studies have been performed, so far. Structural fluctuations are one of features of hydrogen bond network. Such fluctuations correspond to isomerizations among isomers having distinct hydrogen bond structures in the cases of clusters. To elucidate dynamical aspects of microscopic hydrogen-bond networks, we have been investigating an IR-induced isomerization of phenol-methanol cluster cations, [PhOH(MeOH$_3$)]$^+$, trapped in a cold ion trap, and its backward reaction. In our experiment, we recorded UV-photodissociation (PD) spectra of [PhOH(MeOH$_3$)]$^+$ with and without IR excitation. An isomerization from the ring- to chain-type isomers can be observed as a decrease in the band intensity of the ring-type isomer and also an increase in that of the chain-type isomer in the UV-PD spectra. In the last symposium, we reported a clear evidence of the isomerization process and also its backward reaction.\footnote{M.\ Ozeki, {\it et al.} RM14, {\it International Symposium on Molecular Spectroscopy}, (2021).} In the present experiment, we carefully examined time propagations of the spectra. As a result, we observed a rapid generation of the chain-type isomers and a change in the UV-PD spectral profiles of the chain-type isomer in the order of 10 $\mu$s. This is due to the re-cooling and the backward reaction of the chain-type isomers within a cold trap. We estimated the temperatures of the chain-type isomers during the re-cooling process by referring to the UV-PD spectra of [PhOH(MeOH$_3$)]$^+$ measured at various temperatures.\footnote{M.\ Orito, {\it et al.} RM13, {\it International Symposium on Molecular Spectroscopy}, (2021).} Details of the observations are presented in the paper.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116506
DOI
https://doi.org/10.15278/isms.2022.WA09
Copyright and License Information
Copyright 2022 held by the authors

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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY