München 2004 – wissenschaftliches Programm
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MO: Molekülphysik
MO 20: Schwingung und Rotation
MO 20.1: Vortrag
Freitag, 26. März 2004, 11:00–11:15, HS 355
Gas Phase Investigation of Strong Hydrogen Bonds by Infrared Spectroscopy — •Eva Cristina Kaposta1, Nicholas L. Pivonka2, Mathias Bruemmer1, Gabriele Santambrogio1, Carlos Cibrian Uhalte1, Matt Nee2, Andreas Osterwalde2, Gert von Helden3, Gerard Meijer3, Daniel M. Neumark2, Ludger Woeste1, and Knut R. Asmis3 — 1Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin, Germany — 2Department of Chemistry, University of California, Berkley, California 94720 USA — 3Fritz-Haber-Institut der Max-Planck-Gesellschaft, Abteilung Molekuelphysik, Faradayweg 4-6, D-14195 Berlin, Germany
Hydrogen bonds govern physical and chemical phenomena ranging from the solvent properties of water to the structure of proteins and nucleic acids. Strong hydrogen bonds are characterized by low exchange barriers and often the central proton or hydrogen atom is shared equally by the two heteroatoms. In the present work we characterize the infrared (IR) spectroscopy of strong hydrogen bonds in the gas phase. IR-photodissociation spectra were measured for (BrHBr)−, (BrDBr)−, (BrHI)− and (BrDI)−, model compounds, which function as precursors for transition state spectroscopy experiments, as well as of the protonated water dimer H5O2+. The spectra were measured in the region from 625 to 1700 wave numbers by combining a tandem mass spectrometer with the output of the tunable, intense free electron laser FELIX.