Intermolecular vibrations of the van der Waals complex pC6H4FCH3…Ar Original Research Article

Resonant two-photon ionization spectrum of pC6H4FCH3…Ar through the S1←S0 transition revealed a number of bands near the origin 000. All these bands except for those due to the internal rotational transitions of the CH3 group, are assigned to the low-frequency intermolecular vibrations. Quantum calculations using the method of linear-combination of three-dimensional harmonic oscillator products (LCHOP) were carried out to assist the spectral assignments.