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          Institute: Fritz-Haber-Institut     Collection: Molecular Physics     Display Documents

ID: 21355.0, Fritz-Haber-Institut / Molecular Physics
Probing a strong hydrogen bond with infrared spectroscopy: Vibrational predissociation of BrHBr·Ar
Authors:Pivonka, Nicholas L; Kaposta, Cristina; Brümmer, Matthias; Helden, Gert von; Meijer, Gerard; Wöste, Ludger; Neumark, Daniel M.; Asmis, Knut R.
Date of Publication (YYYY-MM-DD):2003-03-22
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Issue / Number:12
Start Page:5275
End Page:5278
Copyright:American Institute of Physics 2003.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The gas phase vibrational spectroscopy of BrHBr–, a prototypical strongly hydrogen-bonded species, has been studied between 6 and 17 µm (590 and 1670 cm–1) by infrared vibrational predissociation of the BrHBr–·Ar ion. Infrared excitation was accomplished using the output of the free electron laser for infrared experiments (FELIX). Predissociation spectra were recorded by monitoring depletion of mass-selected BrHBr–·Ar ions as a function of excitation wavelength. Four prominent absorption bands are observed at 733, 890, 1048, and 1201 cm–1. They are assigned to the fundamental of the hydrogenic stretching mode 3 and a sequence of 3 + n1 combinations (n = 1–3). Additional features to the blue of these bands spaced by ~21 cm–1 are attributed to combination bands involving motion of the Ar messenger atom. Differences in the relative intensities of the 3 + n1 combinations bands in comparison to previous matrix experiments are rationalized on the basis of the underlying dissociation dynamics.
Free Keywords:bromine compounds; argon; quasimolecules; hydrogen bonds; infrared spectra; vibrational states; predissociation
External Publication Status:published
Document Type:Article
Communicated by:Gerard Meijer
Affiliations:Fritz-Haber-Institut/Molecular Physics
External Affiliations:Department of Chemistry, University of California, Berkeley, California, USA, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA, Institut für Experimentalphysik, Freie Universität Berlin, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Nieuwegein, The Netherlands, Department of Molecular and Laser Physics, University of Nijmegen,The Netherlands,
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