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The weak intermolecular forces and spectroscopy of the van der Waals(vdW)complexes between rare-gas(Rg)atoms and the CS2 molecule have attracted considerable attention in recent years.The spectroscopy of these complexes can provide very useful information on the intermolecular potential energy surface(PES)and dynamics of these weakly bound molecules.In the previous ab initio potential energy surface and bound states calculations,the CS2 monomer is assumed as a rigid rotor.The rigid monomer model is usually good for microwave spectra,but not enough for infrared spectra,which involves excitation of the intramolecular vibrations.In particular,the shift of the band origin in the observed infrared spectra cannot be correctly reproduced using the rigid monomer model.