HIGH RESOLUTION PHOTOELECTRON SPECTROSCOPY OF Au$_2^-$ and Au$_4^-$ BY PHOTOELECTRON IMAGING
MetadataShow full item record
Publisher:Ohio State University
We report high resolution photoelectron spectra of Au$_2^-$ and Au$_4^-$ obtained with a newly-built photoelectron imaging apparatus. Gold anions are produced by laser vaporization and the desired specie is mass selected and focused into the collinear velocity-map imaging (VMI) lens assembly. The design of the imaging lens has allowed us to obtain less than 0.9\% energy resolution for high kinetic energy electrons ( \textgreater\ 1eV) while maintaining wavenumber resolution for low kinetic energy electrons. Although gold dimer and tetramer have been studied in the past, we present spectroscopic results under high resolution. For Au$_2^-$, we report high resolution spectra with an accurate determination of the electron affinity together with a complete vibrational assignment, for both the anion and neutral ground states, while for Au$_4^-$, we are able to resolve a low frequency mode and obtain accurately the adiabatic detachment energy.
Author Institution: Department of Chemistry, Brown University, Providence, Ri 02912, Usa
Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.