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  • Artikel: DFG Deutsche Nationallizenzen  (20)
  • 1970-1974  (15)
  • 1950-1954  (5)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (20)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 242 (1971), S. 210-219 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A way is shown to transform the Faddeev equations of the atomic three-body problem into a set of integral equations with symmetric kernel. The method is treated in more detail for total angular momentumJ=0 and applied to calculating the binding energy of theH − ion.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 254 (1972), S. 250-268 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Electrical resistance and optical transmission, reflexion and absorption of thin films of the alkali metal cesium were measured as a function of thickness, the latter for ∥ and ⊥ polarised monochromatic radiations having wavelengths between 3000 and 9000 Å incident from the vacuum side as well as from the quartz-support side at angles of 45 ° and ca 30 ° resp. The films were prepared by evaporation in static ultra-high vacuum (∼10−10 Torr) onto a cooled (70 K) smooth surface of a thin, plane-parallel plate of polycrystalline quartz. The thickness of the slowly condensing films was varied continuously from zero to some thousand Angström-units corresponding to the bulk metal. The results obtained permit, on the one side, by means of the size effect in the resistance, the determination of the mean free path of the conduction electronsl and of the productp∞ ·l, a constant characterising fundamental electronic properties of the respectiv metal in bulk; they permit, on the other side the identification of the volume- or the surface character of the different plasma oscillations, the determination of their resonance frequency, a quantitative analysis of their development with increasing film thickness, and finally of the optical constants.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Nb3Sn diffusion layers were irradiated with 24 MeV oxygen ions at fluences from 3.2×1013 up to 1.6×1015 cm−2. The enhancement of the superconducting critical current density Δj c has been measured as a function of fluence and of the external magnetic fieldH a(j c⊥H a). The thermal annealing treatment of the defects concerning thej c and induced by irradiation, has been investigated in the temperature region from 200 to 800 °C. The results are compared with the measurements of irradiation of Nb3Sn with protons and deuterons. The measured data are discussed in connection with size of defects, cluster distance, fluxline distance and pinning-force.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 264 (1973), S. 21-38 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The optical constants of the alkali metal sodium have been measured in the wavelength region from 0.3 to 2.5 Μm in the solid and liquid state at temperatures between 90 and 370 K, by analysing intensity and polarisation of the monochromatic radiations reflected by the surface of the metal. These mirrolike surfaces, free of contamination and not distorted by any treatment, were prepared and measured in ultrahigh vacuum. The purity of the metal was checked by measuring the residual resistance at liquid helium temperatures. The values thus obtained forn, k,ɛ 1=n 2-k 2 andɛ 2=2nk, listed in tables, and their temperature dependence permit to separate quantitatively the absorption due to different absorption mechanisms and to determine some of the quantities describing the behaviour of the free electrons.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Optical transmission spectra in the region of the volumeplasma-frequencyω p were measured for ⊥ polarized radiations incident on thin potassium films either from the vacuum (front) side at an angle of 45° or from the quartz-support (back) side at about 32°±2° according to wavelength. The films were prepared by evaporation in static ultra-high vacuum (∼10−10 Torr) on a smooth surface of a thin, plane-parallel platelet of polycrystalline quartz cooled either to 10 K or to 80 K, their thickness being exactly measured by means of the Langmuir-Taylor ionisation method. The minimum of the transmission curves givingω p was found independent of thickness for films condensed at 10 K, but decreasing in the same thickness region with decreasing thickness for films condensed at 80 K. This variation as well as the differences between the values of ωp determined by various authors are attributed to varying degrees of surface roughness of the films used.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 249 (1972), S. 400-423 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The optical constants of the alkali metal rubidium have been measured in the wavelength region from 0,3 to 2,4 μ in the solid and liquid state at temperatures between 195 and 313 °K, by analysing intensity and polarisation of the monochromatic radiations reflected by the surface of the metal. These mirrorlike surfaces, free of any contamination and not distorted by any treatment, were prepared and measured in ultrahigh vacuum. The purity of the metal was checked by measuring the residual resistance at liquid helium temperatures. The values thus obtained forn,k, ɛ1=n 2−k 2 and ɛ2=2nk, listed in tables, and their temperature dependence permit the determination of 1. the frequency of the volume-plasmaoscillation, 2. the core polarizability, 3. the optical mass, 4. the optical conductivity resp. relaxation time, 5. and to separate the temperature dependent “Drude”-absorption from other temperature independent absorption mechanisms, particularely the interband absorption. Values of the reflectivity for perpendicular incidence and of the penetration depth are determined and given.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 249 (1972), S. 386-399 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The results of measurements of the Hall-effect in the alkali metals sodium, potassium, rubidium and cesium in the solid and the liquid state are communicated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 138 (1954), S. 353-362 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Zusammenfassung Es wird am Beispiel der elektrischen Leitfähigkeit uud des äußeren lichtelektrischen Effektes gezeigt, wie mit Hilfe der Methode der dünnen Schichten die Entwicklung typisch makroskopischer Eigenschaften beim Übergang vom Einzelatom zum kompakten Festkörper quantitativ verfolgt werden kann. Dabei können wichtige Grundgrößen, wie mittlere freie Weglänge der lichtelektrischen und der Leitungselektronen u.a.m. bestimmt werden.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Monatshefte für Chemie 105 (1974), S. 46-54 
    ISSN: 1434-4475
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The crystal structure of Si5O[PO4]6 has been determined and refined by least-squares, using three-dimensional X-raydata fromWeissenberg photographs: space group R 3;a=7.869 andc=24.138 Å;Z=3; 418 independent reflections;R=6.0%. The crystal structure consists of isolated [SiO6] octahedra and [Si2O7] groups which are linked by [PO4] tetrahedra forming a three-dimensional network. The average interatomic distances are: Si[6]−O=1.768, Si[4]−O=1.607 and P−O=1.52i Å. The compound is isotypic with Ge5O[PO4]6.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Monatshefte für Chemie 103 (1972), S. 460-463 
    ISSN: 1434-4475
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wurden Germanate der Zusammensetzung Ca2Al[AlGeO7] und Ca2Ga[GaGeO7] dargestellt und mittels Einkristallaufnahmen untersucht. Die beiden Verbindungen haben Melilith-Struktur und bilden eine lückenlose Mischkristallreihe. Für erstgenannte Verbindung ergibt die Intensitätsrechnung eine statistische Al/Ge-Verteilung, analog der Al/Si-Verteilung im Gehlenit, Ca2Al[AlSiO7].
    Notizen: Abstract Germanates of composition Ca2Al[AlGeO7] and Ca2Ga[GaGeO7] have been synthesized and studied by means of single-crystal photographs. The compounds crystallize with melilite structure and form a continuous solid solution. The intensity calculation for the first-named phase indicates a statistical Al/Ge-distribution, analogous to the Al/Si-distribution in gehlenite, Ca2Al[AlSiO7].
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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