COMPUTER MODELING OF HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPE IMAGES OF THE (001) AU FILM SURFACE

Using a computer-generated model of the (001) surface of Au a number of image computations were performed to match experimental electron micrographs taken at 100 kV and 1 MeV. The analysis included the effects of microscope objective lens, partial coherence, energy spread of the incident beam, energy loss of the primary beam in the specimen and beam tilting. Close agreement between the computations and experiments was attained; however, exact identification of atomic sites at 100 kV was not possible since the apparent phase contrast artifacts dominate image contrast. The power spectra of 100 kV computed images reveal the fundamental lattice periodicity. Methods for correcting or improving images at 100 kV were considered as well as the possibility of direct interpretation of images at 500 kV and 1 MeV incident beam energies. © 1979.