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Proceedings Paper

Resonant ion-dip infrared spectroscopy of hydrogen-bonded clusters
Author(s): R. Nathaniel Pribble; Rex K. Frost; Frederick Hagemeister; Timothy S. Zwier
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Paper Abstract

Resonant ion-dip infrared spectroscopy (RIDIRS) is used to record near-infrared spectra of several size-selected (benzene)m(solvent)n molecular clusters. In benzene-H2O and benzene-HOD, large-amplitude motions of the water molecule on the benzene ring produce unusual OH stretch infrared absorptions. In the former complex, seven resolved transitions appear in the OH stretch region, rather than the two expected of a rigid complex. In C6H6-HOD, several combination bands involving internal rotation and in-plane torsion of the HOD have intensities greater than the OH stretch fundamental. Similar spectra of the (C6H6)2-H2O complex show that such large-amplitude motions are effectively quenched by the presence of the second benzene molecule. RIDIR spectra of C6H6-(CH3OH)n with n equals 1 - 5 are also presented. In C6H6-(CH3OH)3, the OH stretch infrared spectrum provides clear evidence that the three methanol molecules attach to benzene as a hydrogen-bonded chain. This occurs despite the fact that the lowest energy structure for the free methanol trimer is a cyclic structure, indicating that the presence of benzene has caused a structural rearrangement of solvent molecules near it.

Paper Details

Date Published: 18 September 1995
PDF: 11 pages
Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); doi: 10.1117/12.220840
Show Author Affiliations
R. Nathaniel Pribble, Purdue Univ. (United States)
Rex K. Frost, Purdue Univ. (United States)
Frederick Hagemeister, Purdue Univ. (United States)
Timothy S. Zwier, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 2548:
Laser Techniques for State-Selected and State-to-State Chemistry III
John W. Hepburn, Editor(s)

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