title: Femtosecond dynamics of cyclopropenylidene, c-C3H2.
abstract: The photophysics of the B (1)B(1) state of isolated cyclopropenylidene, c-C(3)H(2), has been studied by femtosecond time-resolved photoionisation and photoelectron spectroscopy. The carbene was produced by flash pyrolysis of 3-chlorocycloprop-1-ene. The bands at 266.9 nm and 264.6 nm have been investigated. The excited state deactivates in a two step process. The first time constant of less than 50 fs corresponds most likely to a nonradiative transition to the A-state, the second one on the order of 200 fs describes the internal conversion to the electronic ground state. The data are compared to those measured for the chlorinated carbene c-C(3)HCl. In the photoelectron spectrum of c-C(3)H(2) resonances were observed which can be assigned to members of a Rydberg d-series.
authors.affiliation: Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Hemberger
authors.forename: Juliane
authors.initials: J
authors.lastname: Köhler
authors.forename: Ingo
authors.initials: I
authors.lastname: Fischer
authors.forename: Giovanni
authors.initials: G
authors.lastname: Piani
authors.forename: Lionel
authors.initials: L
authors.lastname: Poisson
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Mestdagh