Hydrogen bonding in isolated, cooled dimers of benzoic acid is explored following
preparation in a free jet expansion. Analysis of the laser excitation spectrum in the
low energy region allows for the identification of the modes involved in hydrogen
bonding in the excited state of the dimer, and cluster formation is noted between the
ground state dimers. Van der Waals complexes of the dimer with rare gas atoms are
also identified. Assignments of the observed dimer modes have been made and the
results are compared with previous studies in solution and matrices and with normal
mode analyses.
Low energy positron interactions with rare gas atoms: threshold features and benchmark cross sections