Abstract: The resonant two-photons ionization technique is employed to study jet-cooled van der Waals (vdW) complex C6H5CH3…N2 through the S1←S0 transition. By Comparing the spectra of isotopic complex C6D5CD3…N2, we have tentatively assigned all the observed spectral features to the complex C6H5CH3…N2. The rich information about the complex intermolecular vdW viberational modes and internal rotation of N2 are obtained by the spectra. The binding energies for the complex C6H5CH3…N2 in the excited electronic state and in the ground electronic state are about 494 cm－1 and 474 cm－1, those are very close to the calculated values.

Key words: van der Walls vibrations, Internal rotation, Binding energy