Time- and frequency-resolved photoionization of the C (2)A(2) state of the benzyl radical, C(7)H(7).

Citation data:

The Journal of chemical physics, ISSN: 1089-7690, Vol: 133, Issue: 7, Page: 074304

Publication Year:
2010
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/6238
PMID:
20726639
DOI:
10.1063/1.3469787
Author(s):
Margraf, Markus; Noller, Bastian; Schroeter, Christian; Schultz, Thomas; Fischer, Ingo
Publisher(s):
AIP Publishing; AMER INST PHYSICS
Tags:
Physics and Astronomy; Chemistry; Benzyl radicals; Biexponential decay; Electronic ground state; Excitation wavelength; Femtosecond pumps; Flash pyrolysis; Free jets; Internal conversions; Multiphoton ionization spectra; Structure and dynamics; Vibronic bands; Wavelength ranges
article description
The structure and dynamics of the C (2)A(2) electronically excited state of the benzyl radical, C(7)H(7), were investigated by nanosecond and femtosecond pump-probe photoionization. A free jet of benzyl radicals was generated by flash pyrolysis from the precursors 2-phenylethyl nitrite and toluene. Nanosecond multiphoton ionization spectra show a number of vibronic bands that are excited in the wavelength range of 290-310 nm. At excitation wavelengths of 305, 301, and 298 nm, rapid biexponential decay of the excited states was observed. Lifetimes at the C-state origin (305 nm excitation) are 400 fs and 4.5 ps. The lifetimes decrease with increasing excitation energy. The dynamics can be understood within a two-step internal conversion to the electronic ground state.