ELISA MILLER, LEONID SHEPS, RYAN CALVI AND CARL LINEBERGER, JILA, Department of Chemistry, University of Colorado at Boulder, Boulder, Co 80309.
We report photoelectron spectra of IBr-(CO2)n to understand the changes in IBr- structure due to clustering. These experiments utilize anion photoelectron spectroscopy combined with velocity map imaging (VMI) to obtain photoelectron energy and angular distributions. Photodetachment of IBr-(X2 +) with 300 nm radiation accesses three neutral states of IBr: the ground state (X1 +) and the next two excited states (3 2 and 3 1). Known excitation energies between the neutral states allow a direct calculation of the EA of IBr, 2.53 eV. Observed vibrational progressions resulting from transitions to the excited 3 states of IBr lead to equilibrium distances. Current experiments on IBr-(CO2)n will be compared to that of the bare anion to understand changes in the structure of the cluster with additional CO2 molecules.