a. REPORT 14. ABSTRACT 16. SECURITY CLASSIFICATION OF: 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

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... 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 ABSTRACT Number of Papers published in peer-reviewed journals: Number of Papers published in non peer-reviewed journals: 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. (a) Papers published in peer-reviewed journals (N/A for none) Enter List of papers submitted or published that acknowledge ARO support from the start of the project to the date of this printing. List the papers, including journal references, in the following categories: (b) Papers published in non-peer-reviewed journals (N/A for none) (c) Presentations