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Updated: Oct 13, 2025

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Isomer-Selective Spectroscopy and Dynamics of Phenol-Ar (n ≤ 5) Clusters
Mitsuhiko Miyazaki1,2, Yuri Sakata2, Megumi Ono2
1Natural Science Division, Faculty of Core Research, Ochanomizu University, Tokyo 112-8610, Japan.
Abstract:
Structures and ionization-induced solvation dynamics of phenol-(argon) clusters, PhOH-Ar (n ≤ 5), were studied by using a variety of isomer-selective photoionization and vibrational spectroscopic techniques. Several higher-energy isomers were found and assigned for the first time by systematically controlling the experimental conditions of the supersonic expansion. This behavior is also confirmed for the PhOH-Kr2 cluster. Solvation structures are elucidated by evaluating systematic shifts in the S1 ← S0 origin and ionization energies obtained by resonance-enhanced photoionization, in addition to the OH stretching frequency obtained by IR photodissociation. Isomer-selective picosecond time-resolved IR spectroscopy for the n = 2 clusters revealed that the dynamics for the ionization-induced intermolecular π → H site-switching reaction strongly depends on the initial isomeric structure. In particular, the reaction time for the (1|1) isomer is 7 ps, while that for (2|0) is <3 ps. This difference shows that the switching time is determined by the distance of the reaction coordinate between the initial π-site and the final OH-site.
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