Two-photon vibronic spectra of vinyl chloride at 7.3-10 eV

The vibronic spectra of vinyl chloride at 7.3-10 eV have been studied using 2+1 resonance-enhanced multiphoton ionization (REMPI) spectroscopy. The geometries and vibrational frequencies of vinyl chloride and its cation calculated with ab initio methods are utilized to compute the Franck-Condon factors. The transitions to the Rydberg states of pi --> ns, np sigma, np pi, nd, nf, and n(Cl)--> 3s are responsible for the observed REMPI spectra of vinyl chloride. The complex vibrational structures for the observed transitions are successfully identified with the aid of calculated Franck-Condon factors. (C) 2001 American Institute of Physics.