Berlin 2001 – scientific programme
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MO: Molekülphysik
MO 12: Posters Friday: Spectroscopy
MO 12.27: Poster
Friday, April 6, 2001, 12:30–15:00, AT3
Nuclear motion effects observed in photoelectron spectra of HCl and DCl molecules — •florian burmeister1, Stacey Sorensen2, Olle Bjorneholm1, Reinhold Fink1, Arnaldo Naves de Brito2, Margit Bassler1, Leif Karlsson1, and Svante Svensson1 — 1Physics Department, Uppsala University Box 530 S-751 21 Uppsala Sweden — 2Department of Synchrotron Radiation Research, INstitute of Physics, University of Lund, Box 118, S-221 00 Lund, Sweden
The HCl inner-valence photoelectron band at 26 eV binding energy has been recorded at high resolution. Discrete peaks arising from at least two separate vibrational progressions are superimposed on the broad continuum. Fano profiles are visible in one of the progressions. This indicates interference between superimposed electronic states. In the isotopic DCl molecular spectrum the discrete lines are less pronounced. A model allowing curve crossing is necessary and the nuclear dynamics has to be considered. In this model both the adiabatic and Born Oppenheimer apporoximations are violated.