PHOTODISSOCIATION SPECTROSCOPY OF (C6H6)3+ - CHARGE LOCALIZATION ON A DIMER UNIT OF (C6H6)3+

Photodissociation spectra of (C6H6)3+ are measured in the 700-1400 nm range. The charge resonance (CR) bands characteristic of (C6H6)2+ are found to be kept almost intact in (C6H6)3+; the spectra show the main band at almost-equal-to 960 nm and relatively weak one at almost-equal-to 1220 nm. The photodissociation cross section of (C6H6)3+ at the 960 nm band is estimated to be comparable with that of the corresponding dimer band at 920 nm. These results suggest that the charge is localized on a dimer subunit, which acts as a chromophoric core for the CR transition in (C6H6)3+.