GROUND-STATE BINDING-ENERGY AND VIBRATIONS OF THE CARBAZOLE AR VAN-DER-WAALS COMPLEX BY PUMP DUMP R2PI MEASUREMENTS

Mass-selective ground state vibrational spectroscopy of the jet-cooled carbazole.Ar complex was performed by populating ground-state levels via a pump/dump laser pulse sequence, followed by selective resonant two-photon ionization of the vibrationally relaxed complexes. Intra- and inter-molecular van der Waals modes in the S0 state are measurable with good signal/noise. The ground-state binding energy can be determined by detecting the negative signals resulting from loss of ground-state population via vibrational predissociation of the complex.