Resonance-Enhanced Multiphoton Ionization of Van der Waals Molecules: Studies of Spectroscopic Shifts of Phenyl Acetylene Clustered with Molecules and Atoms

摘要

Van der Waals molecules comprised of phenyl acetylene (PA) clustered with rare-gas atoms, R(R=Ne, Ar, Kr, Xe) and other molecules, M (M =N2, O2,N2O, CO2, H2O, CCl4, and NH3) were formed via adiabatic expansion from a pulsed nozzle, subjected to resonance-enhanced MPI, and analyzed in a time-of-flight mass spectrometer. Studies of the perturbed L sub b(superscript 1 B sub 2) states reveal spectral shifts with respect to the aromatic molecule monomer. In the case of the rare-gas atoms the shift in frequency, which is red, linearly increases with the polarizability of the atom. Red-shifts were also seen for all other molecules except CO2 and H2O, where an appreciable blue-shift was observed in the case of the latter. (Author)