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排序方式: 共有174条查询结果,搜索用时 62 毫秒
31.
M.L. Shek P.M. Stefan D.L. Weissman-Wenocur B.B. Pate I. Lindau W.E. Spicer V.S. Sundaram 《Surface science》1982,115(1):L86-L91
Photoemission and Auger electron spectroscopy on Pt0.98Cu0.02 show that the (110) face has over twice as much Cu surface segregation as the (111) face. The Cu 3d-derived surface “density of states” differ strikingly in peak shape and in width (by 0.5 eV). The centroids, compared with bulk Cu d states, are shifted by more than 0.3 eV towards the Fermi level. This is the first experimental correlation between surface segregation and surface bonding. 相似文献
32.
I. Lindau W.E. Spicer P. Pianetta P.W. Chye C.M. Garner 《Journal of Electron Spectroscopy and Related Phenomena》1979,15(1):197-200
Photoemission techniques (core level, valence band and partial yield spectroscopies) using synchrotron radiation as the excitation source have been applied to study the changes in the surface electronic structure of the (110) cleavage face of III-V semiconductor surfaces as a function of different ad-atom coverages. In this paper we concentrate on Au overlayers on GaSb and in particular address the problem of the mechanism for Fermi level pinning and the formation of Schottky barrier heights. It appears that the Fermi level pinning is fully established at a small fraction of a monolayer coverage. Core level spectroscopy gives evidence for a strong metal-semiconductor interaction leading to decomposition of GaSb at the interface. The experimental results form the basis for proposing a new model for the Schottky barrier based on defect states at the interface. 相似文献
33.
34.
Ingolf Teipel 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1963,14(2):155-160
Résumé En général, on peut indiquer deux fonctions de courant pour le mouvement du fluide. Pour l'écoulement autour d'un profil et autour d'un corps de révolution à l'incidence nulle, la deuxième fonction est triviale. Dans cet article, il est montré que l'on n'obtient pas de solutions triviales pour un corps de révolution dont l'axe est incliné. Dans un exemple, les deux fonctions sont calculées pour un corps de révolution dont la section est parabolique. 相似文献
35.
M. Oshima B.B. Pate Z.M. Lu P.J. Jupiter I. Lindau W.E. Spicer 《Solid State Communications》1983,46(11):815-818
The alloy formation and oxidation of a Nb-rich Nb-Al alloy has been studied using core level photoemission in combination with synchroton radiation as a surface sensitive probe. Exactly the same chemical shifts were observed from both the Nb-Al alloy and an Al-evaporated Nb surface, indicating similar structural arrangements. It is found that the oxidation rate of Nb in these structures is drastically decreased in comparison to either pure Nb metal or Nb3Sn. Two stages in the oxidation of the Nb-Al alloy are clearly distinguished by chemical shifts of the Al2p, Nb4p and O2p levels. 相似文献
36.
37.
I. Lindau P. Pianetta W.E. Spicer P.E. Gregory C.M. Garner P.W. Chye 《Journal of Electron Spectroscopy and Related Phenomena》1978,13(3):155-160
The surface electronic structure of cleaved GaAs (110) is found to be very sensitive to small amounts of adsorbed oxygen. For example, adsorbing oxygen on only a few percent of the surface Ga or As atomic sites can produce changes of a factor of two in the surface electronic structure. Thus, long range effects must be involved, and these are associated with rearrangement of the surface atoms. 相似文献
38.
39.
M. B. Tsetlin A. A. Zakharov A. P. Menushenkov A. A. Ivanov M. N. Mikheeva I. Lindau 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(6):928-930
The surface of epitaxial Nd1.85Ce0.15CuO4 ? y (001) (NCCO) film has been studied by low energy electron diffractometry (LEED) and photoelectron spectroscopy. Ar+ ion etching of a surface with subsequent annealing in oxygen at atmosphere pressure has been found to lead to the ordered structure restoration of surface layers with the symmetry type and lattice parameters corresponding to the NCCO phase. Annealing in vacuum at temperatures close to the boundary of thermodynamic phase stability results in the formation of epitaxial Ce0.5Nd0.5O1.75 phase on a surface that is indicated in the LEED pattern as additional spots corresponding to the surface lattice (√2 × √2)R45°. 相似文献
40.
Kofanova OA Zemlyanskikh NG Ivanova L Bernhardt I 《Bioelectrochemistry (Amsterdam, Netherlands)》2008,73(2):151-154
Changes of the intracellular Ca2+ content in human red blood cells (RBCs) in glycerol-containing solutions and after freeze-thawing the cells with glycerol and subsequent deglycerolization were investigated with the Ca2+-sensitive fluorescent dye fluo-4 using fluorescence microscopy. In the glycerol-containing solutions the Ca2+ content increased when compared with a physiological medium (Hepes buffered saline solution (HBSS)). This effect was most likely a result of an inhibition of the Ca2+ pump. After inhibiting the Ca2+ pump using o-vanadate, the Ca2+ uptake was not significantly different in the cells in glycerol-containing and physiological medium. Freeze-thawing and deglycerolization of RBCs resulted in a more pronounced increase in the Ca2+ content. Also in this case, the Ca2+ pump seemed to play a major role. 相似文献