Time- and frequency-resolved photoionization of the C (2)A(2) state of the benzyl radical, C7H7
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- Time- and frequency-resolved photoionization of the C (2)A(2) state of the benzyl radical, C7H7
- Margraf, Markus; Noller, Bastian; Schroeter, Christian; Schultz, Thomas; Fischer, Ingo
- 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
- Issue Date
- AMER INST PHYSICS
- JOURNAL OF CHEMICAL PHYSICS, v.133, no.7, pp. -
- The structure and dynamics of the C A2 2 electronically excited state of the benzyl radical, C7 H7, 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.
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