The mixed dynamic form factor for atomic core-level excitations in interferometric electron-energy-loss experiments

The mixed dynamic form factor (MDFF) is the basic quantity in inelastic ele ctron scattering experiments. Although it is often dominated by the usual d ynamic form factor, it can in principle be measured in interferometry-like inelastic electron scattering experiments which have gained increasing popu larity. We therefore derive an expression for the MDFF for atomic core-leve l excitations and discuss it in detail. Simulations for silicon, using Hart ree-Slater-like atomic wave functions, illustrate the results. Beyond the t heoretical interest, two practical applications to the measurement of the M DFF are envisaged.