Measurement of Absorption Parameters of Copper for 500 kV Electrons

概要

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Absorption parameters of copper for 500 kV electrons are measured by means of the dynamical theory of electron diffraction of two-beam approximation by analysing the images of thick-ness fringes photographed with the single-beam and the two-beam methods. A bent wedge-shaped crystal is observed in the two-beam image using both the primary and the reflected beams with a large aperture as well as in the bright-field and the dark-field images using a small aperture. The following values of the absorption parameters have been obtained ξ_<220>/ξ'_0=0.070±0.007 and ξ_<220>/ξ'_<220>=0.051±0.003 at a temperature of 300 K, and ξ_<220>/ξ'_0=0.053±0.004 and ξ_<220>/ξ'_<220>=0.042±0.003 at a temperature of 200 K. Many-beam effects on the images of thickness contour are considered.
社団法人応用物理学会の論文
1973-12-05