Photoelectron imaging spectroscopy of molecular and cluster anions:: CS2- and OCS-(H2O)1,2

We report the photoelectron imaging study of molecular and cluster anions CS2- and OCS-(H2O)(1,2) at 800, 529, and 400 nm, comparing the results for the hydrated OCS- cluster ions to CS2-. The photoelectron angular distributions are interpreted qualitatively using group theory in the framework of the one-electron, electric-dipole approximations. The energetics of OCS-(H2O)(1,2) are compared to the theoretical predictions. The vertical detachment energies of OCS-.H2O and OCS-(H2O)(2) are determined to be 2.07+/-0.07 and 2.53+/-0.07 eV, respectively. An indirect estimate of the adiabatic electron affinity of OCS yields a value of -0.04 eV. (C) 2002 American Institute of Physics.