High-resolution spectroscopy of aniline-rare gas Van der Waals complexes: results and comparison with theoretical predictions

Laser-induced fluorescence spectra are presented for the first allowed electronic transitions in the near-UV of the aniline-argon and aniline-neon 1:1 Van der Waals complexes, formed in a molecular beam. The experimental linewidth was of the order of 10−3 cm−1 due to residual Doppler broadening and lifetime contributions. Single rotational eigenstates were resolved and complete sets of spectral assignments obtained using a rigid-rotor Hamiltonian model. From the rotational constants we extract both structural and dynamical information on the different clusters. This information is better understood in the light of a comparison with the results of quantum calculations.