Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.27: Poster

Freitag, 6. April 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.