Double photoionisation of toluene

Spectra of doubly ionised toluene have been taken by the TOF-PEPECO method at photon energies of 26.91, 32.69 and 40.81 eV. The location of the adiabatic double ionisation threshold near 23.6 eV, as recently proposed by Roithovل et al. is confirmed. Photoionisation to the ground state of the doubly charged ion is found to be dominated by autoionisation, at least at photon energies above 26 eV. Dissociation of the doubly charged ion, examined by PEPIPICO experiments, sets in at energies above 25.5 eV; the products formed at the lowest energies are C 7 H 6 2 + + H 2 and C 2 H 3 + + C 5 H 5 + .