Abstract
The absorption coefficientsμ el andμ unel for fast electrons (30–50 keV) due to elastic and inelastic scattering in polycrystalline foils of Al, Ag and Au have been measured at various temperatures between 160 and 600 °K. It is shown that,μ unel decreases only slightly with temperature. On the other hand, the absorption coefficientμ el, which is composed ofμ R for Laue Bragg scattering andμ TDS for thermal diffuse scattering increases with temperature. Asμ R andμ TDS depend on temperature in opposite sense, the resulting increase ofμ el=μ R+μ TDS with temperature depends on the extent, to which the temperature dependence ofμ R is reduced by dynamical extinction effects.
For Al the measured temperature dependence ofμ el is in good agreement with the theoretical calculation ofμ TDS on the basis of the Einstein model and ofμ R according to the two beam approximation of the dynamical theory.
For Ag and Au the temperature dependence ofμ el is much more pronounced than for Al. This is due to the facts that for heavy elements firstly the elastic scattering is stronger and secondly dynamical extinction effects are generally more pronounced. In order to study the influence of dynamical extinction, the crystal size of the foils was varied.
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Hansen-Schmidt, J., u. M.Horstmann: Z. Naturforsch. 20a, 1239 (1965).
Der Verfasser dankt Herrn Professor Dr. H.Raether und Herrn Privatdozent Dr. M.Horstmann herzlich für die Themenstellung und Förderung der Arbeit.
Die Deutsche Forschungsgemeinschaft unterstützte diese Arbeit in großzügiger Weise durch die Bereitstellung finanzieller Mittel und verschiedener Geräte.
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Hansen-Schmidt, J. Temperaturabhängigkeit der Absorptionskoeffizienten für mittelschnelle Elektronen in polykristallinen Aluminium-, Silber- und Goldschichten. Z. Physik 198, 433–444 (1967). https://doi.org/10.1007/BF01326419
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DOI: https://doi.org/10.1007/BF01326419