Resonant two-photon ionization spectra of o, p, m-xylene...Ar-n (n=1,2)

The resonant two-photon ionization technique (R2PI) is used to study jet-cooled van der Waals (vdW) complexes o, p, m-xylene...Ar-n (n = 1, 2) through the S-1 <-- S-0 transition around the origin band. We have tentatively assigned the main spectral features of these vdW complexes. The transitions of these complexes are red-shifted from those of the monomers. The influence of the substituent positions on the vdW vibrations is investigated