The intermolecular vibration in fluorotoluene-argon complexes

Resonant multi - photon ionization spectra of three fluorotoluene - argon c omplexes through the S-1<--S-0 transition are observed, using resonant mult i - photon ionization, together with time - of - flight mass spectrometry, in supersonic molecular beam. By the spectra analysis and theory calculatio n, the stretching vibrational frequencies and two bending vibrational frequ encies of the three complexes are obtained. The results show after F atom a nd methyl group CH3 substitute H atom in benzene ring, their relative posit ion has very little influence on the stretch vibration of the complexes, bu t strong effect on bending vibration. In addition in the complexes, Ar atom has apparent obstruction to the internal rotaton of the methyl group.