Die optischen Konstanten des Rubidiums im Wellenlängenbereich von 0,3 bis 2,4 μ und ihre Abhängigkeit von Temperatur und Aggregatzustand

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, ?₁=n ²?k ² and ?₂=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.     

Die optischen Konstanten des Cäsiums im Wellenlängenbereich von 0,3 bis 2,5 μ und ihre Abhängigkeit von Temperatur und Aggregatzustand

The optical constants of the alkali metal cesium have been measured in the wavelength region from 0.3 to 2.5 μ in the solid and liquid state at temperatures between 90 and 302 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, ?₁=n ²-k ² and ?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.     

Die optischen Konstanten von Au,Ag und ihren Legierungen im Energiebereich 2,4 bis 4,4 eV

The optical constants (real and imaginary part of the dielectric constant) were determined on thin films (300 to 400 Å thickness) of Au, Ag and their alloys in the energy region from 2.4 to 4.4 eV. Transmission and reflection of light was used. The data were compared with those of other authors. Plasmaresonance measurements are added.     

Der Zusammenhang zwischen dem magnetooptischen Kerr- und Faraday-Effekt und die optischen Konstanten von dicken Aufdampfschichten aus Eisen,Kobalt und Nickel

The magnetical rotation of the plane of polarisation and the ellipticity of the reflected and transmitted light through magnetically saturated, evaporated layers of iron, cobalt and nickel (30 to 100 mμ) are dependent one another according to the phenomenological theory of W.Voigt. The four measured magnetooptical angles are however independent each other. By comparison of other physical properties, except the magnetooptical ones, (f. e. magnetical saturation, optical absorption) measured respectively with transmitted and with reflected light, we try to prove, that the layers are homogenous at least near the glass-side. The linear increase of Faraday-rotation and optical absorption with the thickness of the layer supports this assumption. Then the independence can only be explaned by a magnetooptical term in the second equation of Maxwell also (precession of spin). The knowledge of the optical constants ist necessary for the comparison of magnetooptical ones. They are find out by measurements of intensity only, using the transmitted light and the reflected light at both sides of the layer. By supernumerarykinds of determination the foult is estimated. The method of Drude is adapted to measurements of intensity and then applied on the glasside too. The results on this side agree with those of transmitted light, the air-side differs a little.     

Die optischen Konstanten von Silber-Gallium-Legierungen in der Nähe der Plasmafrequenz

Zeitschrift für Physik A Hadrons and nuclei - Plasmaresonance absorption on thin Ag foils and Ag-Ga alloys up to 19.3 at.% Ga is used to determine the optical constants ? of these foils....     

Bestimmung der optischen Konstanten von Lithium und Natrium durch optisch angeregte Oberflächenplasmaschwingungen

The ATR method to excite surface plasmons by light is used to measure optical constants of Lithium and Natrium in the energy region 2–3.8 eV. For energies smaller than 3.5 eV the real part of the dielectric function can be described by the equations valid for the free electron gas. The imaginary part shows an interband transition (~ 2.5 eV at Li, ~ 2.0 eV at Na), which is rather slow (about 1 eV) indicating an indirect transition.     

Bestimmung von optischen Konstanten an Palladium und Silber aus Energieverlustmessungen im Energiebereich von 2 bis 90 eV

The energy loss functions Im (?1/?) of Silver and Palladium are determined from energy loss experiments with 60 keV electrons. The influence of surface effects and multiple losses is discussed and the values of Im (?1/?) are corrected for them. By means of Kramers-Kronig analysis the optical constants? ₁ and? ₂ are calculated from the energy loss function and found to be in good agreement with data derived from optical experiments by various authors.     

Zur Theorie der anomalen Reflexion von optischen Strichgittern

Zeitschrift für Physik A Hadrons and nuclei - Es werden die von Wood (1902, 1935) bei der Beugung von Licht an metallischen Strichgittern beobachteten Intensitätsanomalien (Woodsche helle...