NONLOCAL PSEUDOPOTENTIALS IN THE MULTISLICE METHOD OF CALCULATING ELECTRON WAVE-FUNCTIONS IN CRYSTALS

A method for including non-local potentials in the multi-slice formalism for calculating electron wavefunctions in crystals is presented. With the assumption that non-local potentials appear only in atomic core regions as correction terms having a so-called separable form, it is shown that these corrections can be included as an additional procedure carried out after each passage through a core region. Possible ways of deriving pseudopotentials of the present type for various fields of electron diffraction and electron microscopy are briefly discussed.