INVERSION OF ELECTRON-SCATTERING INTENSITY FOR CRYSTAL-STRUCTURE ANALYSIS

The validity domain of a recently proposed iterative scheme for the in version of the wavefunction of fast electrons after dynamical diffract ion in a crystal, which is based on re versal of the multislice algori thm, is investigated by Bloch wave analysis. It is shown that the sche me fails when the thickness of the crystal is such that the scattering is sufficiently strong for dominant Bloch wave structure to appear in the wavefunction. The scheme could still be useful, however, in exten ding the range of interpretable resolution and specimen thickness for which electron scattering can be applied to crystal structure analysis .