title: Femtosecond pump/probe photoelectron spectroscopy of isolated C60 negative ions.
abstract: We have measured pump/probe photoelectron spectra of mass-selected, near room temperature C60- in the gas phase. The lifetime of the vibrationally excited B- (2Eg) state at a calculated energy of 1.26 eV was found to be tau = 2.2+/-0.2 ps. The dominant decay process corresponds to intramolecular radiationless transitions into ground state C60-. This is in contrast to C60 for which pumping at the absorption onset (1.95 eV) leads to predominantly intersystem crossing.
authors.affiliation: Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany.
authors.forename: Oli T
authors.initials: OT
authors.lastname: Ehrler
authors.forename: Ji Ping
authors.initials: JP
authors.lastname: Yang
authors.forename: Christof
authors.initials: C
authors.lastname: Hättig
authors.forename: Andreas-N
authors.initials: AN
authors.lastname: Unterreiner
authors.forename: Horst
authors.initials: H
authors.lastname: Hippler
authors.forename: Manfred M
authors.initials: MM
authors.lastname: Kappes