Systematic photoelectron-spectroscopy studies of the oxygen adsorption on a polycrystalline copper in a wide range of oxygen exposures allowed us to trace the step-by-step transformation of the electronic structure of pure Cu into the electronic structure of Cu 2 O . With the use of the density-of-states calculations implemented by the full-potential linear muffin-tin-orbital method, the interpretation of a number of features in the photoelectron spectra and their behavior with the increase of oxygen exposure was carried out. It was also shown that copper-surface oxidation proceeds in three main steps.
The fluorescent V Kp, emission bands from the pure metal and binary alloys of transition elements Co, Ni, Rh, Pd, Ir, and Pt have been investigated. In the alloys V,Rh, V3Pd, V&, and V3Pt the V Kp, bands are split in two principal subbands. These spectrum changes are related to the energy separation of d-band components.Die V Kp,-Fluoreszenzemissionsbanden des reinen Metalls und von biniiren Legierungen der ubergangselemente Go, Ni, Rh, Pd, Ir und Pt wurden untersucht. In den Legierungen V3Rh, V3Pd, VJr und V3R sind die V Kp,-Banden in zwei Hauptsubbanden aufgespalten. Diese hderungen der Spektren werden mit den Energieabstiinden der d-Bandkomponenten verknijpft.
X-ray K-emission bands of the metal atoms from Me,X-compounds (V,Ga, V,Si, V,Ge, Cr3Si) are investigated. A multiple-band structure of the energy spectrum is found characterized by a number of overlapping bands related to non-metallic s-, p-, and metallic dpstates. The results of theoretical calculations for V3Ga, V,Si, and V,Ge (Mattheiss [9]) are found to correlate well with experimental data. Some deviations, especially in the lower part of valence band are attributed to the choice of the crystal potential. On the basis of experimental results if seems possible to suggest theoretical ralculations using a crystal potential corresponding to the 3d34s2 vanadium atom configuration. The relationship between the electronic structure of Me,X-compounds and the change of their superconducting properties is discussed.Es werden die K-Rontgenemissionsbanden der Metallatome von Me,X-Verbindungen (V,Ga, V,Si, V,Ge, Cr,Si) untersucht und eine Mehrbandenstruktur des Energiespektrums gefunden, die duroh eine Anzahl iiberlappender Banden, die mit nichtmetdlischen s-, prrnd metallischen dp-ZustLnden verkniipft sind, charakterisiert ist. Es wird gefunden, daB die Ergebnisse theoretischer Berechnungen fur V,Ga, V,Si und V,Ge (Mattheiss [9]) gut mit experimentellen Werten ubereinstimmen. Einige Abweichungen, besonders im iinteren Teil des Valenzbandes, werden der Wahl des Kristallpotentials zugeschrieben. An Hand der experimentellen Ergebnisse scheint es miiglich z u sein, theoretische Berechnungen mit einem Kristallpotential vorzuschlagen, das der 3d34s2 Konfiguration des Vanadiums entspricht. Die Beziehung zwischen der Elektronenstruktur von Me,X-Verbindungen und den dnderungen der Supraleitungseigenscliaften werden diskutiert.
The results of investigation of CrKP,-emission bands from pure metal and from Cr,Xcompounds are considered. A conclusion about the structure of the energy bands in Cr3X-compounds is made after discussion of these data together with X-ray spectra of the second component, theoretical calculation of the electron structure, and experimental results obtained by photoemission. A detailed comparison of the X-ray spectra of V,X-and Cr,Xcompounds is made. E s werden die Ergebnisse von Untersuchungen der CrKP,-Emissionsbanden von reinen Metallen und Cr,X-Verbindungen betrachtet. Aus der Diskussion dieser Werte zusammen mit den Rontgenspektren der zweiten Komponente, der theoretischen Berechnung der Elektronenstruktur und experiinentellen Photoemissionsergebnissen wurde auf die Struktur der Energiebiinder in Cr,X-Verbindungen geschlossen. Es wird ein ausfiihrlicher Vergleich der Rontgenspektren der V,X-und Cr3X-Verbindungen durchgefiihrt.
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