Femtosecond pump/probe photoelectron spectroscopy of isolated C60 negative ions |
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Authors: | Ehrler Oli T Yang Ji Ping Hättig Christof Unterreiner Andreas-N Hippler Horst Kappes Manfred M |
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Institution: | Institut für Physikalische Chemie, Universit?t Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany. |
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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. |
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