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Full-Text Articles in Physics
Thermochemistry Of The Gadolinium-Copper Interface, D. Lagraffe, Peter A. Dowben, M. Onellion
Thermochemistry Of The Gadolinium-Copper Interface, D. Lagraffe, Peter A. Dowben, M. Onellion
Peter Dowben Publications
We have characterized the thermochemistry of the gadolinium-copper interface using valence-band photoemission. We find that the copper substrate binds strongly with the gadolinium overlayer, based upon valence-band binding-energy shifts that occur with increasing gadolinium coverages on Cu(100). The net potential for copper at the interface is 3.82 eV/atom which is some 0.51 eV/atom greater than the heat of sublimation for copper. The strong bonds formed between copper and gadolinium provide a thermochemical driving force for copper gadolinium-alloy formation. We observed a surface-to-bulk core-level shift for gadolinium of 0.3–0.4 eV. We also observed a Cu 3d binding-energy increase of 0.73 …
Magnetic Ordering Of Thin Gd Overlayers, D. Lagraffe, Peter A. Dowben, M. Onellion
Magnetic Ordering Of Thin Gd Overlayers, D. Lagraffe, Peter A. Dowben, M. Onellion
Peter Dowben Publications
1–6-monolayer-thick films of Gd have been studied with use of synchrotron-radiation photoemission. A method is described that utilizes the linear light polarization to obtain information about the overlayer magnetization. The method is complementary to electron-spin-polarization techniques. The thinner Gd overlayers exhibit a local magnetization component along the surface normal that decreases for thicker overlayers. The Gd films exhibit a 5d exchange splitting that changes from approximately 1.1 to 0.6 eV as the overlayer thickness increases.
Chemical Vapor Deposition Of Boron And Boron Nitride From Decaborane(L4) A), Yoon Gi Kim, Peter A. Dowben, J.T. Spencer, G.O. Ramseyer
Chemical Vapor Deposition Of Boron And Boron Nitride From Decaborane(L4) A), Yoon Gi Kim, Peter A. Dowben, J.T. Spencer, G.O. Ramseyer
Peter Dowben Publications
We have investigated photoassisted, plasma enhanced chemical vapor deposition and pyrolytic deposition of boron from decaborane (B10H14) and boron nitride from decaborane combined with nitrogen or ammonia. The use of decaborane for depositing boron and boron nitride thin films is seen as a viable alternative to diborane or boron halides.
The Decomposition Of [Mn(Co)5]2(Μ-Sih2), G.T. Stauf, Peter A. Dowben, K. Emrich, W. Hirschwald, N.M. Boag
The Decomposition Of [Mn(Co)5]2(Μ-Sih2), G.T. Stauf, Peter A. Dowben, K. Emrich, W. Hirschwald, N.M. Boag
Peter Dowben Publications
The prospect of using chemical vapor deposition to deposit mixed metals and silicides from a single source compound is attractive but largely uninvestigated. Studies of decomposition energies of such compounds are nearly nonexistent. One such compound which has successfully been used to make a silicide coating is [Mn(CO)5 12 (μ-SiH2). We have used electron impact mass spectroscopy, photoionization mass spectroscopy, and photoabsorption to determine bond energies within this compound. The combination of methods allows a high degree of confidence in the resultant ionization and fragment appearance potentials. Some possible mechanisms of decomposition are discussed. A complete …
The Influence Of Crystallographic Order Upon The Electronic Structure Of Thin Mercury Overlayers, Peter A. Dowben, M. Onellion, Shikha Varma, Y.J. Kime, J.L. Erskine
The Influence Of Crystallographic Order Upon The Electronic Structure Of Thin Mercury Overlayers, Peter A. Dowben, M. Onellion, Shikha Varma, Y.J. Kime, J.L. Erskine
Peter Dowben Publications
Thin ( 1-7 monolayer) well-ordered, disordered, and liquid Hg overlayers on Ag(100) have been investigated with angle resolved photoemission and low-energy electron diffraction. The well-ordered overlayers exhibit new electronic states as a result of the strained, cubic, overlayer crystallographic structure. The new electronic states depend upon the long-range crystallographic order of the overlayer, not simply the local crystallographic symmetry. The photoemission cross section and branching ratio of the 5d mercury states depends on the overlayer long-range crystallographic order and cannot be explained by photoelectron diffraction.