Vacuum ultraviolet mass-analyzed threshold ionization spectroscopy of benzene: Vibrational analysis of C6H6+ and C6D6+ in the X̃2E1g state

초록

One-photon MATI spectra of C<inf>6</inf>H<inf>6</inf> and C<inf>6</inf>D<inf>6</inf> were obtained by using tunable and coherent VUV radiation generation by four-wave difference frequency mixing in Kr. The spectra were simple compared to the two-photon ZEKE and MATI spectra reported previously. Vibrational data for the neutral benzene and the previous assignment for the cation made by utilizing two-photon ZEKE peaks, IR-induced photodissociation peak, and calculated results were useful to assign the peaks into the one-photon spectra. Also useful was the selection rule for Rydberg transition which classifies the transitions into three groups in terms of intensity, electric dipole-allowed, vibronically allowed, and g,u-forbidden vibronic transitions.