A Multiple Scattering Theory of Thermal-diffuse Scattering for Low-Energy Electrons

1970 ◽  
Vol 25 (5) ◽  
pp. 752-760 ◽  
Author(s):  
Anthony R. Moon
Keyword(s):  
Multiple Scattering ◽  
Scattering Theory ◽  
Diffuse Scattering ◽  
High Energy ◽  
Perfect Crystal ◽  
Low Energy ◽  
Thermal Diffuse Scattering ◽  
Multiple Scattering Theory ◽  
Low Energy Electrons ◽  
Thermal Diffuse

A perturbation theory of thermal diffuse scattering of low-energy electrons is developed along the lines of von Laue's “reciprocity theorem” approach successfully used by Kainuma in the consideration of diffuse scattering in high-energy electron diffraction. This theory takes into account the multiple scattering of the electrons within the crystal, and is so formulated that it may be used in conjunction with present LEED calculations for the elastic scattering from a perfect crystal. It is shown that by a pseudokinematical approximation for the perfect crystal wave functions, the normal pseudokinematical result for the diffuse intensity is obtained. Under certain conditions differences between the multiple scattering theory and the pseudokinematical theory are expected to occur. These deviations have their origin in resonance processes. Some numerical results comparing the two theories are presented.

scholarly journals Thermal Diffuse Scattering of Low-Energy Electrons from Xe

1973 ◽  
Vol 7 (2) ◽  
pp. 802-810 ◽  
Author(s):  
L. L. Kesmodel ◽  
F. W. de Wette ◽  
R. E. Allen
Keyword(s):  
Diffuse Scattering ◽  
Low Energy ◽  
Thermal Diffuse Scattering ◽  
Low Energy Electrons ◽  
Thermal Diffuse

MULTIPLE SCATTERING CALCULATIONS OF GBMEED

1997 ◽  
Vol 04 (05) ◽  
pp. 959-963
Author(s):  
U. KORTE
Keyword(s):  
Multiple Scattering ◽  
Scattering Theory ◽  
Diffuse Scattering ◽  
Grazing Incidence ◽  
Medium Energy ◽  
Surface Layers ◽  
Thermal Diffuse Scattering ◽  
Focusing Effect ◽  
Diffraction Effects ◽  
Thermal Diffuse

A method for computing grazing-incidence backscattering medium energy (1–3 keV) electron diffraction (GBMEED) is presented. The technique was recently proposed as a structural tool exhibiting diffraction effects resembling those of XPD. In GBMEED the intensity of quasielastically thermal diffuse scattering is measured at large scattering angles such that different atoms can be assumed to vibrate independently, and thus represent localized sources for diffuse scattering in the surface layers. The basis of the calculations is the multiple scattering theory of diffuse RHEED adopted to the medium energy case with a vibrating atom as source of diffuse scattering. Calculated plots of the intensity versus azimuthal/polar exit angle for an In overlayer on Si(111) show the forward focusing effect along the source-scatterer direction (well known from XPD) and further fine structure.

Diffraction Pattern Caused by X-Ray Thermal Diffuse Scattering in Absorbing Perfect Crystal

1988 ◽  
Vol 57 (2) ◽  
pp. 524-534 ◽  
Author(s):  
Yasuji Kashiwase ◽  
Masahiro Mori ◽  
Motokazu Kogiso ◽  
Masayuki Minoura ◽  
Satoshi Sasaki
Keyword(s):  
Diffraction Pattern ◽  
Diffuse Scattering ◽  
Perfect Crystal ◽  
Thermal Diffuse Scattering ◽  
X Ray ◽  
Thermal Diffuse

Importance of the nucleon Fermi motion in the pion–nucleus elastic scattering

1977 ◽  
Vol 55 (24) ◽  
pp. 2158-2165 ◽  
Author(s):  
K. Nakano ◽  
Chi-Shiang Wu
Keyword(s):  
Elastic Scattering ◽  
Multiple Scattering ◽  
Scattering Theory ◽  
Scattering Amplitude ◽  
Low Energy ◽  
Multiple Scattering Theory ◽  
Fermi Motion ◽  
Energy Scattering ◽  
Careful Treatment ◽  
Nucleus Scattering

The importance of the nucleon Fermi motion in π–nucleus elastic scattering is investigated in the framework of the multiple scattering theory. Conventional factorization approximations on the π–nucleus scattering amplitude are compared with calculations that take into account the nucleon Fermi motion by using π–12C as an example. The importance of a careful treatment of the Fermi motion in low energy scattering will be stressed.

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