Resonant ion-dip infrared spectroscopy of hydrogen-bonded clusters

R. Nathaniel Pribble; Rex K. Frost; Frederick Hagemeister; Timothy S. Zwier

doi:10.1117/12.220840

18 September 1995 Resonant ion-dip infrared spectroscopy of hydrogen-bonded clusters

R. Nathaniel Pribble, Rex K. Frost, Frederick Hagemeister, Timothy S. Zwier

Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220840
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

R. Nathaniel Pribble, Rex K. Frost, Frederick Hagemeister, and Timothy S. Zwier "Resonant ion-dip infrared spectroscopy of hydrogen-bonded clusters", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); https://doi.org/10.1117/12.220840

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