Time-resolved photoelectron spectroscopy of the CH{sub 3}I B{sup I}E 6s [2] state.

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Physical Chemistry Chemical Physics

DOI:https://doi.org/10.1039/C004220J· OSTI ID:1039503

Thire, N; Cireasa, R; Blanchet, V; Pratt, S T ^[1]

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1. 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 Laboratory (ANL)
• Sponsoring Organization: SC; ANR COCOMOUV; ANR HARMODYN
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1039503
• Report Number(s): ANL/CSE/JA-66481
• Journal Information: Physical Chemistry Chemical Physics, Journal Name: Physical Chemistry Chemical Physics Journal Issue: 48 Vol. 12; ISSN 1463-9076
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
DECAY
EXCITATION
IONIZATION
LIFETIME
MONITORING
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
PHOTONS
PREDISSOCIATION
RYDBERG STATES
SPECTRA
TIME DEPENDENCE
VELOCITY