title: Resonant processes and Coulomb interactions in (C59N)2.
abstract: We have determined the on-site molecular Coulomb interaction energy U of a (C59N)2 bulk film and find values ranging from 1.10+/-0.10 eV for the highest occupied molecular orbital to 1.35+/-0.10 eV for the deeper lying orbitals, comparable to values found in C60. The on-site Coulomb interaction between a carbon core hole and valence electrons, Uc, is, however, substantially lower than in C60 at 1.35+/-0.07 eV. Resonant photoemission (RESPES) results show a weakened participator decay channel, especially around the N 1s threshold, where resonance of the highest occupied molecular orbital shoulder is absent. Near-edge x-ray absorption fine structure and constant initial state measurements, taken in parallel with the RESPES data, indicate, however, that matrix element effects cannot be ruled out.
authors.affiliation: School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Schulte
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: P J
authors.initials: PJ
authors.lastname: Moriarty
authors.forename: K
authors.initials: K
authors.lastname: Prassides
authors.forename: N
authors.initials: N
authors.lastname: Tagmatarchis