PROBING SOLVATION EFFECTS OF IBr$^{-}$(CO$_{2}$)$_{n}$ BY PHOTOELECTRON SPECTROSCOPY
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Date
2007
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Ohio State University
Abstract
We report photoelectron spectra of IBr$^{-}$(CO$_{2}$)$_{n}$ 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$^{-}$(X$^{2}\Sigma^{+}$) with 300 nm radiation accesses three neutral states of IBr: the ground state (X$^{1}\Sigma^{+}$) and the next two excited states ($^{3}\Pi_{2}$ and $^{3}\Pi_{1}$). 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$\Pi$ states of IBr lead to equilibrium distances. Current experiments on IBr$^{-}$(CO$_{2}$)$_{n}$ will be compared to that of the bare anion to understand changes in the structure of the cluster with additional CO$_{2}$ molecules.
Description
Author Institution: JILA, Department of Chemistry, University of Colorado at Boulder, Boulder, Co 80309