CuPt-B Ordered Microstructures in GalnP and GalnAs Films
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Selected-area electron diffraction patterns (DPs), dark-field (DF) images, and lattice images were acquired on a CM30 TEM with a 12-bit charge-coupled device camera operated at 300 kV. In cross section, samples were oriented near A, or a , located 26.60 about [001] from B. Plan-view examinations were performed near A (19.5' from [001]). A mixture C of DF images A and B from complementary ordered domains C = (I - 17)tA + BI + q A - BI
(1)
shows enhanced similarities with mixing parameter 1 = 0, and enhanced differences with
17= 1.
Image FFTs are linear mixtures of original image FFTs 1(g) with filtered copies 0(g)1(g). The filter functions 0(g) are judiciously selected sums of eccentric Gaussian masks, which are often Fresnel pairs. The filtered image is generated by inverse transformation of the filtered FFT
"l'(g)= W(1- f)
(2)
+ fO(g)]l(g)
The filtering parameter 0 _
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