Size and shape effects on the broadening of the plasma resonance absorption of light in metallic samples are investigated. The relation between three different quantum mechanical methods which have been used in the past to calculate this broadening, is clarified. The general theory is applied to various specific geometries, and some physical implications are discussed.Es wird der EinfluD der Form und GroBe der Proben auf die Verbreiterung der Plasmaresonanzabsorption von Licht in Metallproben untersucht. Die Beziehung zwischen drei unterschiedlichen quantenmechanischen Methoden, die bereits zur Berechnung dieser Verbreiterung angewendet wurden, wird geklart. Die allgemeine Theorie wird dann auf unterschiedliche Probengeometrien angewendet. Es werden einige physikalische Auswirkungen beaprochen .

The rate of energy absorption by inverse bremsstrahlung of a plasma in an oscillating electric field is calculated. An expression for this rate is obtained that is valid for all ranges of the electron-plasma temperature and density and the electric field flux intensity and polarization, Analytical formulas are obtained for high-flux intensities where the rate is independent of the electron-velocity-distribution function.

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The formal theory of the preceding paper is applied to antiferromagnetic Cr 2 0 3 . By calculating the magnetic and magnetoelectric susceptibilities, we compare the theories one with another and with experiment, and investigate the parameter sensitivity of the results. The data favor the random-phase approximation in the Green's-function theory. The discrepancy between different theories is generally substantial. The parallel magnetoelectric susceptibilities is dominated by the g-iactor and double-ion terms, as expected. The inclusion of an anisotropic coupling has only marginal consequences.

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