Implementation of Inverse Photoelectron Spectroscopy for Measuring the Empty Electronic States of Metal Oxide Surfaces.

摘要

Inverse photoelectron spectroscopy (IPES) has been implemented at the University of Massachusetts Lowell through this ARO-funded DURIP award. The instrumentation consists of a low energy electron gun and a photon detector installed in an ultrahigh vacuum (UHV) chamber. When impinging electrons land in unoccupied electronic states, photons are emitted which contain information regarding the energies of the states. The UHV chamber was already in place at UMass Lowell, and the IPES equipment and associated electronics were added to it. This UHV chamber already had ultraviolet photoelectron spectroscopy (UPS) capability. The combination of UPS and IPES in the same instrument makes possible measurements of the energies and densities of filled and empty electronic states. Testing of the instrument is now complete, and initial results on oxidized zirconium have been performed.