Journal of Chemical Physics, Vol.103, No.10, 4035-4045, 1995
Van-der-Waals Binding-Energies and Intermolecular Vibrations of Carbazole-Center-Dot-R (R=ne, Ar, Kr, Xe)
Mass-selective ground-state vibrational spectra of jet-cooled carbazole R (R=Ne, Ar, Kr, and Xe) van der Waals complexes were obtained by populating ground-state intra- and intermolecular levels via stimulated emission pumping, followed by time delayed resonant two-photon ionization of the vibrationally hot complex. By tuning the dump laser frequency, S-0 state vibrational modes were accessed from approximate to 200 cm(-1) up to the dissociation energy D-0. Upon dumping to ground-state levels above D-0, efficient vibrational predissociation of the complexes occurred, allowing us to determine the S-0 state van der Waals binding energies very accurately. The D-0(S-0) values are <214.5+/-0.5 cm(-1) (R=Ne), 530.4+/-1.5 cm(-1) (R=Ar), 687.9+/-4.0 cm(-1) (R=Kr), and 890.8+/-1.6 cm(-1) (R=Xe). In the S-1 state, the corresponding binding energies are larger by 9% to 12%, being <222.9+/-1.0 cm(-1), 576.3+/-1.6 cm(-1), 756.4+/-4.5 cm(-1), and 995.81+/-2.5 cm(-1), respectively.
Keywords:ROTATIONAL COHERENCE SPECTROSCOPY;THRESHOLD IONIZATION SPECTROSCOPY;STIMULATED-EMISSION SPECTROSCOPY;VANDERWAALS MOLECULES;FLUORESCENCE SPECTROSCOPY;PARA-DIFLUOROBENZENE;ANISOLE.AR COMPLEX;ARGON CLUSTERS;DIPOLE-MOMENT;BENZENE