Cj. Rossouw et al., TRANSMISSION RESONANCE DIFFRACTION AND LOW IMPACT PARAMETER INELASTIC-SCATTERING OF HIGH-ENERGY ELECTRONS, Ultramicroscopy, 72(1-2), 1998, pp. 17-29
Since the development of the theoretical treatment of transmission (bu
lk) resonance scattering of high-energy electrons it has been anticipa
ted that this type of many-beam diffraction could lead to a substantia
l increase in the cross-section of all inelastic interactions characte
rized by small impact parameters of electron-atom collisions. However,
until recently ring Kikuchi patterns remained the only existing confi
rmation of this prediction, showing the increase of the cross-section
of thermal diffuse scattering due to resonance diffraction in the fina
l state of the process of inelastic interaction. In this paper we repo
rt the results of the first experimental observation showing the incre
ase of the cross-section of inelastic scattering (X-ray production and
high-angle backscattering) detected as a function of two angles of in
cidence, i.e. the effect associated with the presence of resonance dif
fraction in the initial state of the process of inelastic electron-ato
m interaction in a crystalline environment. We discuss possible implic
ations of our findings for atom site determination in transmission hig
h-energy electron diffraction. (C) 1998 Elsevier Science B.V. All righ
ts reserved.