Observation of the IR-induced isomerization of hydrated phenol cations trapped in the cold ion trap

Sato, Hikaru

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https://hdl.handle.net/2142/100545 Copy

Description

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

Issue Date

2018-06-18

Keyword(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(H2O)5] + a . In the cold condition (30 K), only an isomer having a ring-with-tail type hydration motif (Rt isomer) exists, whereas chain-like (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 Rt isomer at 30 K, and found a OH stretch band that is specific for the Rt isomer at 3330 cm−1 . Next, the IR laser light at 3330 cm−1 was irradiated to the Rt isomers in the cold trap. After 3 µs from the IR excitation, we observed UV photodissociation spectra. As a result, an increase of the intensity at the band of the C isomer (25400 cm−1 ) was clearly observed. This change indicates the IR induced isomerization of the Rt isomer to the C isomer. Moreover, we observed a cooling of the C isomer produced by the IR excitation by the collisions with He buffer gas in the trap.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100545

DOI

10.15278/isms.2018.MK02

Copyright and License Information

Copyright 2018 Hikaru Sato

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