Two‐Dimensional Comparison of Electron Micrographs with Computer Calculations

Two methods of displaying two‐dimensional intensity data are developed and used to compare many‐beam dynamical theory calculations with electron micrographs. The effect of different published values of the real lattice potential is investigated and for Cu‐10 at% Al the following values of the imaginary lattice potential V ′ g were obtained, expressed in terms of U ′ g = 2 me V ′ g / h 2 : U ′ 111 / U 111 = 0.0275 ± 0.0025, U ′ 0 / U 111 = 0.0358 ± 0.0026, U ′ 0 = 0.007 ± 0.0005 Å −2 . The many‐beam effects at high microscope accelerating voltages are considered.