PHOTOIONIZATION OF CO-60 AND C-70 IN LIQUID ALKANES

Single photon ionization of C60 in 2,2-dimethylpropane (neopentane, NP ), 2,2,4,4-tetramethylpentane (TMP), 2,2-dimethylbutane (neohexane, DM B), and 2,2,4-trimethylpentane (isooctane, iso-OCT), and of C70 in TMP was studied by photoconductivity measurement. Threshold energies of t he photoconductivity were determined. From these results, the polariza tion energies and the ionic radii of the cations were obtained by appl ication of Born's formula. The ionic radii turned out to be smaller th an the van der Waals radii of the molecules.