Fragmentation energetics and dynamics of fluorobenzeneAr n (n=1-3) clusters studied by mass analyzed threshold ionization spectroscopy New assignments in the UV spectroscopy of the small benzene-argon n clusters: The effects of a structureselective vibrational predissociation Size-resolved benzene-argon clusters, ͑C 6 H 6 ͒Ar n , nϭ13-40, were generated by supersonic expansion and studied by ultraviolet resonant two-photon ionization spectroscopy through benzene's B 2u ←A 1g 6 0 1 transition. The size-specific sequence of cluster spectra reveals six features that can be isolated, allowing for an independent analysis of each feature's evolution. In the n ϭ13-40 range, each cluster spectrum is well described by the sum of between two (nϭ13) and five (nϭ17-24,26-29) Gaussian features. Only two spectral features ͑D,E͒ span the 28-cluster sequence, while each of the other four features appears over a limited consecutive cluster size range ͑A:nϭ14-39; B:nϭ17-29; C:nϭ14-24; F:nϭ26-40͒. The evolution of the spectral shift, width, and relative amplitude is traced for each feature. The observations are rationalized through a model that has been previously developed for the discussion of benzene-argon cluster data. We report for the first time a ''high shift'' spectral feature, observed at a spectral shift of Ϫ80 cm Ϫ1 , which approaches the bulk shift more closely than anything previously reported.