PHOTOIONIZATION THRESHOLD STRUCTURE OF FULLERENES: VIBRATIONAL EXCITATION

H. Steger, J. de VRIES, A. Hielscher, W. Kamke and I.V. Hertel
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H. Steger: Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
J. de VRIES: Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
A. Hielscher: Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
W. Kamke: Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
I.V. Hertel: Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 781-784

Abstract: The threshold region of the photoionization spectra of fullerenes shows distinct changes of slope which are typical for the opening of additional channels due to vibrational excitation. Typically, after evaporation from a hot oven,C60is excited in all its vibrational modes. Through coupling with the ionization transition only the two highly symmetric modes (breathing mode and tangential stretch mode) can be excited or de-excited. An analysis of theC60data reveals very good agreement of the observed structure with the expected energetic positions of various combinations of excitation and de-excitation of these two modes.

Date: 1996
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DOI: 10.1142/S0218625X96001406

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