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Issue 48, 2010
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Time-resolved photoelectron spectroscopy of the CH3I B1E 6s [2] state

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Abstract

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.

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

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Article information


Submitted
12 Mar 2010
Accepted
17 May 2010
First published
29 Jul 2010

Phys. Chem. Chem. Phys., 2010,12, 15644-15652
Article type
Paper

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

N. Thiré, R. Cireasa, V. Blanchet and S. T. Pratt, Phys. Chem. Chem. Phys., 2010, 12, 15644
DOI: 10.1039/C004220J

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