Band dispersion in C[sub 60](111): An angle-resolved photoemission study
- Ames Laboratory and Iowa State University, Ames, Iowa 50011 (United States)
- Department of Materials Science and Chemical Engineering, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
Angle-resolved photoemission studies of single-crystal C[sub 60](111) films grown on GeS(001) reveal changes in valence feature line shape with emission angle and photon energy that are indicative of band dispersion. For an excitation energy ([ital h][nu]) of 10 eV, normal emission spectra show four sharp structures within the [similar to]1.1-eV-wide valence feature derived from the second highest molecular orbital (HOMO[minus]1) of C[sub 60]. For [ital h][nu]=8.1 eV, the 1-eV-wide HOMO-derived feature exhibits changes with emission angle mainly due to dispersion of 0.6 eV in the unoccupied bands. The distribution of electronic states underlying HOMO and HOMO[minus]1 indicates that vibronic loss structures are not necessary to explain the width of these valence features.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6886984
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:15; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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