Multiple Elastic Intramolecular Scattering in Gas Electron Diffraction

Abstract

The effects of multiple elastic intramolecular scattering on gas‐electron‐diffraction patterns are calculated in the second Born approximation. Expressions for the first‐order double‐ and triple‐scattering contributions are obtained. An approximate expression convenient for computation, for the first‐order triple‐scattering term is also given. The relationships of the magnitude of the multiple scattering to atomic number, atomic size, and molecular structure are investigated. It is shown that corrections to the reduced molecular‐intensity function of the order of several percent can occur in the case of triple scattering from three or more heavy atoms in close proximity.