University of Illinois Urbana-Champaign

Temperature Dependence In Relative Populations Between Isomers Having Distinct Hydrogen Bond Structures Of Phenol-methanol Cluster Cations

Ishikawa, Haruki

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4906.pdf
RM13_4906.pdf

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https://hdl.handle.net/2142/111586

Description

Title
Temperature Dependence In Relative Populations Between Isomers Having Distinct Hydrogen Bond Structures Of Phenol-methanol Cluster Cations
Author(s)
Ishikawa, Haruki
Contributor(s)
  • Ozeki, Masayoshi
  • Orito, Masataka
Issue Date
2021-06-24
Keyword(s)
Action spectroscopy (incl. PE, PD, PI, LIR)
Date of Ingest
  • 2021-09-24T21:10:05Z
  • 2022-01-21T16:09:18Z
Abstract
Gas-phase hydrogen-bonded clusters are treated as microscopic models of hydrogen bond networks. We have been investigating the temperature effect on microscopic hydrogen bond structures. In our previous study, we measured ultraviolet photodissociation (UVPD) spectra of hydrated phenol cations [PhOH(H$_2$O)$_5$]$^+$ trapped in our temperature-variable ion trap. We revealed temperature dependence of relative populations between two isomers having distinct hydrogen bond structures.\footnote{H.~Ishikawa, I.~Kurusu, R.~Yagi, R.~Kato, Y.~Kasahara, \textit{J. Phys. Chem. Lett.} \textbf{8}, 2641 (2017).} It is known that water and methanol molecules construct different hydrogen bond networks. Thus, we measured UVPD spectra of phenol-methanol cluster cations [PhOH(MeOH)$_n$]$^+$ ($n=3, 4$) in the present study. As in the case of [PhOH(H$_2$O)$_5$]$^+$, isomers having ring type hydrogen bond structures are dominant in cold condition for both $n = 3$ and 4 cases. As the temperature elevates, populations of the chain type isomers become large in the case of the $n =3$. Both bands for the ring and chain type isomers exhibit red shifts of the band positions and broadening of the band widths along the temperature elevation were observed. These changes were attributed mainly by hot bands of the intermolecular vibrational modes. In contrast, only the bands assigned as the ring isomers were observed with the temperature below 150 K. However, changes in the band profiles indicate structural changes within a ring type hydrogen bond motif.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111586
DOI
10.15278/isms.2021.RM13

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY