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Title:OBSERVATION OF THE IR-INDUCED ISOMERIZATION OF HYDRATED PHENOL CATIONS TRAPPED IN THE COLD ION TRAP
Author(s):Sato, Hikaru
Contributor(s):Ishikawa, Haruki; Kasahara, Yasutoshi; Kato, Ryota
Subject(s):Clusters/Complexes
Abstract:Gas-phase hydrated clusters are treated as a microscopic model of hydration networks. Recently, we have revealed the temperature-dependence of hydration structures of hydrated phenol cation, [PhOH(H$_2$O)$_5$]$^+$\,\footnote{H.~Ishikawa, I.~Kurusu, R.~Yagi, R.~Kato, Y.~Kasahara, \textit{J. Phys. Chem. Lett.} \textbf{8}, 2641 (2017).}. In the cold condition (30 K), only an isomer having a ring-with-tail type hydration motif ({\it Rt} isomer) exists, whereas chain-like ({\it C}) isomers are dominant in the hot condition (150 K). Since isomerizations among the isomers having distinct hydration motifs can be related to structural fluctuations in the bulk systems, we have been investigating the isomerization between these two isomers induced by the IR vibrational excitation for the further understanding of the microscopic hydration. At first, we observed an IR spectrum of the {\it Rt} isomer at 30 K, and found a OH stretch band that is specific for the {\it Rt} isomer at 3330\,cm$^{-1}$. Next, the IR laser light at 3330\,cm$^{-1}$ was irradiated to the {\it Rt} isomers in the cold trap. After 3 $\mu$s from the IR excitation, we observed UV photodissociation spectra. As a result, an increase of the intensity at the band of the {\it C} isomer (25400\,cm$^{-1}$) was clearly observed. This change indicates the IR induced isomerization of the {\it Rt} isomer to the {\it C} isomer. Moreover, we observed a cooling of the {\it C} isomer produced by the IR excitation by the collisions with He buffer gas in the trap.
Issue Date:06/18/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100545
DOI:10.15278/isms.2018.MK02
Other Identifier(s):MK02
Date Available in IDEALS:2018-08-17
2018-12-12


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