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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: 2018-08-172018-12-12
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