SOLVATION OF CHARGE IN AROMATIC NOBLE GAS VAN-DER-WAALS CLUSTERS/

The results of an experimental study of the ionisation threshold in th e various structural isomers of the Van der Waals clusters aniline-(ar gon)(n) (n = 1-5) and 4-fluorostyrene-(argon)(n) (n = 1-2) using reson ant two-photon ionisation are reported. The data validate and generali se the site-specific modified shift additivity rule. They show an inte resting influence of the localisation of argon atoms at the surface of the chromophore on the value of the net shift of the ionisation poten tial. Interpretation of the results involves evaluation and balancing between the charge-induced-dipole interaction and dispersion interacti on. (C) 1997 Elsevier Science B.V.