Theoretical Study on the High-Energy Electron Energy Loss Spectroscopy Compared with X-Ray Absorption Spectroscopy. I. Deep Core Excitation from K and L_2,3 Edge of Atoms

Abstract

In this series of papers we are investigating the magnitude of the dipole and non-dipole processes observed in the high-energy electron energy loss spectroscopy (EELS) related to deep core orbitals. The present paper describes the atomic excitation from deep K and L 2,3 edges. We discuss the amount of discrepancy which emerged in the intensity of electron scattering when only assuming a dipole interaction and its dependence on the scattering angle, excitation energy and type of excited core levels. From this discussion, one can justify the means to obtain the same electronic and geometric information by an analysis of electron energy loss fine structure and the near-edge structure observed in high-energy EELS for small-angle scattering.