Femtosecond dynamics of cyclopropenylidene, c-C3H2

P. Hemberger (1) , J. Kohler (1) , I. Fischer (1) , G. Piani (2) , L. Poisson (2) , J.-M. Mestdagh (2)

1 Institut fur Physikalische und Theoretische Chemie,
2 LFP - URA 2453 - Laboratoire Francis PERRIN

The photophysics of the B B-1(1) state of isolated cyclopropenylidene, c-C3H2, 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-C3HCl. In the photoelectron spectrum of c-C3H2 resonances were observed which can be assigned to members of a Rydberg d-series.

Domaines: Chimie théorique et/ou physique

P. Hemberger, J. Kohler, I. Fischer, G. Piani, L. Poisson, et al.. Femtosecond dynamics of cyclopropenylidene, c-C3H2. Physical Chemistry Chemical Physics, 2012, 14 (8), pp.6173-6178. ⟨10.1039/C2CP23728H⟩. ⟨hal-00724301⟩