| Femtosecond negative-ion photoelectron imaging spectroscopy allows the probing of dynamics resulting from solvation and photodissociation in both the time-resolved and solvent domains. First, the basic premise of photoelectron imaging shall be presented, followed by a discussion of qualitative approaches for interpreting photoelectron angular distributions as illustrated by application to the photoelectron images of S2- and CS 2-. The photoelectron images of CS2 - serve as a reference for interpreting the results for homogeneous and heterogeneous solvation in CO2 and OCS cluster anions. The effects of solvation upon the photoelectron angular distribution and the photoelectron energy spectrum are discussed in relation to (OCS)n- , OCS-·H2O, (CO2) n-, and (CO2)n(H2O) m-. The (OCS)2- cluster anion images show evidence of competition of excited state decay pathways and coexistence of isomers. The evolution of photoelectron images, resulting from I2Br- dissociation shows the evolving electronic structure of the I- channel as the anion dissociates. |
