Oli Th. Ehrler¹, Ji Ping Yang², Christof Hättig³, Andreas-N. Unterreiner¹, Horst Hippler¹, and Manfred M. Kappes^4
1 Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany
² Institut f¨r Nanotechnologie, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany and Department of Applied Physics, Hefei University of Technology, Hefei 230009, China
³ Institut für Nanotechnologie, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany
⁴ Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany and Institut für Nanotechnologie, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany

J. Chem. Phys. 125, 074311 (2006).
(Received 18 May 2006; accepted 6 July 2006; published online 21 August 2006)

We have measured pump/probe photoelectron spectra of mass-selected, near room temperature C^-₆₀ in the gas phase. The lifetime of the vibrationally excited B^-(²E_g) state at a calculated energy of 1.26 eV was found to be τ=2.2 +/- 0.2 ps. The dominant decay process corresponds to intramolecular radiationless transitions into ground state C^-₆₀. This is in contrast to C₆₀ for which pumping at the absorption onset (1.95 eV) leads to predominantly intersystem crossing. (c) 2006 American Institute of Physics.

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