VIBRATIONALLY RESOLVED PHOTOELECTRON SPECTRA OF ANNEALED${\rm C}_n^-$AND${\rm Si}_n^-$CLUSTERS

G. Schulze Icking-Konert, H. Handschuh, P.S. Bechthold, G. Ganteför, B. Kessler and W. Eberhardt
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G. Schulze Icking-Konert: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany
H. Handschuh: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany
P.S. Bechthold: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany
G. Ganteför: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany
B. Kessler: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany
W. Eberhardt: Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, D-52425 Jülich, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 483-487

Abstract: Photoelectron spectra of annealed carbon-cluster anions${\rm C}_n^-$n=5–70, are presented which show vibrational fine structure. From the vibrational frequencies, theoretical results, and ion mobility measurements, the geometry of the clusters can be determined: clusters withn=5, 7, and 9 are linear chains;n=10, 12, 14, 16, and 18 build monocyclic rings; forn=20, 24, and 28 the vibrational features correspond best to bicyclic rings; and for evenn>30fullerenes are found. In contrast to carbon, the mass distribution of silicon-cluster anions (up ton≈30) does not change dramatically upon annealing. An enhanced abundance of typical fragmentation products${\rm Si}_n^-$withn=4, 6, 7, and 10 is found. The vibrational fine structure for${\rm Si}_7^-$agrees with that of a pentagonal bipyramid.

Date: 1996
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DOI: 10.1142/S0218625X96000875

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