Accession Number : AD1010312


Title :   New Insights in Catalytic Sites: Characterization of Spectroscopy and Reactivity of Metal Oxide Clusters with Anion Slow Electron Velocity-Map Imaging


Descriptive Note : Technical Report,01 May 2012,30 Apr 2016


Corporate Author : The University of California, Berkeley Berkeley, United States


Personal Author(s) : Neumark,Daniel M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1010312.pdf


Report Date : 08 Jun 2016


Pagination or Media Count : 26


Abstract : One of the outstanding problems in all of physical chemistry is to understand reactive sites in heterogeneous catalysts, many of which comprise complex transition metal oxides. Size-selected transition metal oxide clusters can serve as tractable model systems for the analogous bulk catalyst. This research program has focused on developing novel spectroscopic probes of such clusters. During the last grant period, slow electron velocity-map imaging of cryogenically cooled anions (cryo-SEVI) was implemented and shown to be a qualitative advance in the spectroscopic investigation of transition metal oxide clusters, yielding high resolution (2cm1) photoelectron spectra from which one can elucidate structural and bonding motifs of the anions and the neutrals generated by photodetachment. There has been a particular focus on polymetallic clusters such asTi2O4, Zr2O4, and Fe3O,since these species have largely been spectroscopically intractable using more conventional methods. Additional experiments based on infrared multiple-photon dissociation of cryo-cooled anions have focused on complex hydrated clusters such as NO3(HNO3)m(H2O)n and HSO4(H2SO4)m(H2O)n that are important in atmospheric chemistry and aerosol formation.


Descriptors :   spectroscopy , metal oxides , ANIONS , chemical reactions , transition metals , photoelectrons


Distribution Statement : APPROVED FOR PUBLIC RELEASE