Reaction Dynamics at Semiconductor Surfaces

Contains report on one research project

Reaction Dynamics at Semiconductor Surfaces

Contains report on one research project

Oxygen Adsorption on Au–Ni(111) Surface Alloys

Molecular O[subscript 2] dissociates upon interaction with a Ni(111) surface, as the spatial and energetic overlap between the Ni 3d electrons and the O[subscript 2] antibonding orbitals is quite favorable. On a Au–Ni(111) surface alloy where the extent of this overlap is greatly reduced, exposure to O[subscript 2] results in adsorption of molecular O[subscript 2] characterized by three peroxo- or superoxo-like vibrational bands centered at 743, 856, and 957 cm[superscript –1] as observed by high resolution electron energy loss spectroscopy. These bands correspond to the stretch vibrational mode of O[subscript 2] at respective adsorption sites of type pseudo-3-fold fcc/hcp, degenerate-pseudo-2-fold fcc/hcp and bridge, and pseudo-3-fold bridge. These unusual chemical environments are brought about by surface alloying, rather than the presence of Au clusters on Ni, and are further stabilized by a dramatic reconstruction of the top two surface layers, as explained with an idealized surface alloy model in conjunction with electronic structure considerations. The ability to adjust the relative populations of the different oxygen cohorts by varying the Au content suggests the utility of surface alloy motifs for engineering applications.United States. Dept. of Energy (DE-FG02-05ER15665)Shell-MITEI Seed Fund Progra

Chemical Reaction Dynamics at Surfaces

Contains reports on four research projects.Joint Services Electronics Program Contract DAAL03-92-C-000

Chemical Reaction Dynamics at Surfaces

Contains reports on three research projects.Joint Services Electronics Program (Contract DAAL03-86-K-0002)Joint Services Electronics Program (Contract DAAL03-89-C-0001)National Science Foundation (Grant CHE 85-08734)MIT Energy Laboratory - Synthetic Fuels CenterPetroleum Research Fund (Contract 19014-AC5

Chemical Reaction Dynamics at Surfaces

Contains reports on four research projects.National Science Foundation (Grant DMR81-19292)National Science Foundation (Grant CHE82-06422)Research CorporationCamille and Henry Dreyfus FoundationMonsant

Chemical Reaction Dynamics at Surfaces

Contains reports on three research projects.Joint Services Electronics Program Contract DAAL03-89-C-0001Joint Services Electronics Program Contract DAAL03-92-C-0001National Science Foundation Grant CHE 90-2062

Chemical Reaction Dynamics at Surfaces

Contains reports on two research projects with publication lists in each section.Joint Services Electronics Program Contract DAAL03-89-C-0001MIT Energy Laboratory Synthetic Fuels CenterNational Science Foundation Grant CHE 85-08734Petroleum Research Fund Contract 19014-AC

Chemical Reaction Dynamics at Surfaces

Contains reports on three research projects.Joint Services Electronics Program Contract DAAL03-92-C-0001National Science Foundation Grant CHE 90-20623U.S. Department of Energy Grant DE-FG02-89-ER1403

Chemical Reaction Dynamics at Surfaces

Contains reports on six research projects.Joint Services Electronics Program Contract DAAL03-89-C-0001MIT Energy Laboratory - Synthetic Fuels CenterNational Science Foundation Grant CHE 85-08734Petroleum Research Fund Contract 19014-AC