Time-resolved photoelectron spectroscopy of the CH{sub 3}I B{sup I}E 6s [2] state.
- Chemical Sciences and Engineering Division
The predissociation dynamics of the vibrationless level of the 6s (B {sup 2}E) Rydberg state of CH{sub 3}I was studied by femtosecond-resolved velocity map imaging of photoelectrons. By monitoring the decay of the CH{sub 3}I{sup +} 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 CH{sub 3}I{sup +} 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 CH{sub 3}I{sup +}. At long delays, the photoelectron spectra are characterized by photoionization of the I({sup 2}P{sub 1/2}) fragment formed by predissociation of the B state.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); ANR COCOMOUV; ANR HARMODYN
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1039503
- Report Number(s):
- ANL/CSE/JA-66481; TRN: US1202155
- Journal Information:
- Physical Chemistry Chemical Physics, Vol. 12, Issue 48; ISSN 1463-9076
- Country of Publication:
- United States
- Language:
- ENGLISH
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