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Full-Text Articles in Physics
Structure-Induced Electronic States For Hg Overlayers On Ag(100), M. Onellion, J.L. Erskine, Y.J. Kime, Shikha Varma, Peter A. Dowben
Structure-Induced Electronic States For Hg Overlayers On Ag(100), M. Onellion, J.L. Erskine, Y.J. Kime, Shikha Varma, Peter A. Dowben
Peter Dowben Publications
Angle-resolved photoemission was used to observe the electronic band structure of one and two monolayers of Hg on Ag(100). Evidence for new Hg electronic states and band structure arising from the hybridization of the atomic 5d5/2 orbitals is presented. Low-energy electron diffraction results indicate that the Hg overlayers assume the face-centered-cubic (fcc) structure of the Ag(100) substrate, which is not the natural (rhombohedral) structure of bulk Hg. The new electronic states are induced as a result of the bonding of Hg atoms with adjacent metal atoms.
Surface Segregation In Binary Alloys, Uresh Vahalia, Peter A. Dowben, Allen Miller
Surface Segregation In Binary Alloys, Uresh Vahalia, Peter A. Dowben, Allen Miller
Peter Dowben Publications
A semiempirical calculation is outlined that allows analysis of experimental results for the apparent surface concentration of binary alloys, obtained by x-ray photoelectron spectroscopy, (XPS). A segregation profile giving the enrichment of the segregating element at and near the surface is obtained from the analysis. Using previously published data for Cu 17 Ni 83 ( 100) and Cu 17 Ni 83 ( 111 ), it is shown that copper segregation is not restricted to the first few layers, but instead extends significantly into the selvedge (near-surface) region. This occurrence is not explainable by the use of present ideal solution models. …
Ionic And Neutral Decompssition Of Gaseous Bromochloromethanes, D.C. Driscoll, J.A. Bishop, B.J. Sturm, Peter A. Dowben, C.G. Olsen
Ionic And Neutral Decompssition Of Gaseous Bromochloromethanes, D.C. Driscoll, J.A. Bishop, B.J. Sturm, Peter A. Dowben, C.G. Olsen
Peter Dowben Publications
The ionization potentials for CCl 4, CCl 3Br, CBr 2Cl 2, CBr 4, CCl 3, and CBr 3 have been measured using electron impact techniques. These numbers have been combined with previously published thermodynamic values in order to construct thermodynamic cycles for ionic and neutral decomposition of the bromochloromethanes. The n to σ*, n to s, and n to p electronic transition energies have also been determined on the basis of photoabsorption spectra.
Epitaxial Growth Of Iron Iodide Films On Fe(L10), D.R. Mueller, T.N. Rhodin, Peter A. Dowben
Epitaxial Growth Of Iron Iodide Films On Fe(L10), D.R. Mueller, T.N. Rhodin, Peter A. Dowben
Peter Dowben Publications
The interaction of iodine vapor on an Fe(110) single crystal surface at room temperature has been investigated primarily through the use of LEED and UPS. Both a series of chemisorbed overlayers and an epitaxial iodide layer are observed. Iodide formation proceeds through an island growth mechanism with the iodide basal plane parallel to the Fe(110) surface. Evidence is presented that the defects introduced on the surface during argon ion sputtering may be important as nucleation sites for iodide growth. The results are compared with the results of previous studies.