Journal of Physical Chemistry A, Vol.115, No.11, 2096-2102, 2011
Photoelectron Imaging Spectroscopy of S-1(B-1(2u) pi,pi*) Benzene via 6(1)1(n) (n=0-3) Levels
We report resonance-enhanced two-photon ionization photoelectron spectroscopy of jet-cooled benzene via the 6(1)1(n) (n = 0-3) vibronic levels in S-1(B-1(2u) pi,pi*) using a nanosecond UV laser and photoelectron imaging. The best energy resolution (Delta E/E) was 0.7%. The photoelectron spectrum from the S-1 6(1)1(3) level (E-vib = 3284 cm(-1)) in the channel three region exhibited a clear signature of intramolecular vibrational redistribution (IVR). The spectral features were consistent with picosecond zero kinetic energy photoelectron (ZEKE) spectra reported by Smith et al. [J. Phys. Chem. 1995, 99, 1768]. The photoelectron angular anisotropy parameter, beta(2) was found to be negative in ionization from the 6(1)1(n)(n = 0-3) levels with photoelectron kinetic energies up to 5000 cm(-1). No influence of a shape resonance was identified.