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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2010

Time-resolved photoelectron spectroscopy of the CH3I B1E 6s [2] state

Résumé

The predissociation dynamics of the vibrationless level of the 6s (B 2E) Rydberg state of CH3I was studied by femtosecond-resolved velocity map imaging of photoelectrons. By monitoring the decay of the CH3I+ produced by photoionizing the B state, the predissociation lifetime was measured to be 1310 ± 70 fs. Photoelectron spectra were recorded as a function of the excitation scheme (one or two photons to the B state), and as a function of the ionizing wavelength. All of these photoelectron spectra show a simple time dependence that is consistent with the decay time of the CH3I+ ion signal. The photoelectron angular distributions for the ionization of the B state depend on the excitation scheme and the ionizing wavelength, and show a strong dependence on the vibrational modes excited in the resulting CH3I+. At long delays, the photoelectron spectra are characterized by photoionization of the I(2P1/2) fragment formed by predissociation of the B state.

Dates et versions

hal-00920758 , version 1 (19-12-2013)

Identifiants

Citer

Nicolas Thiré, Raluca Cireasa, Valérie Blanchet, Steven T. Pratt. Time-resolved photoelectron spectroscopy of the CH3I B1E 6s [2] state. Physical Chemistry Chemical Physics, 2010, 12, pp.15644-15652. ⟨10.1039/C004220J⟩. ⟨hal-00920758⟩
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