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X‐ray Propagation in Distorted Crystals: From Dynamical to Kinematical Theory
Author(s) -
Malgrange C.
Publication year - 2002
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200207)37:7<654::aid-crat654>3.0.co;2-e
Subject(s) - distortion (music) , extinction (optical mineralogy) , wavelength , intensity (physics) , physics , optics , condensed matter physics , classical mechanics , computational physics , geometry , mathematics , optoelectronics , amplifier , cmos
The successive studies of the propagation of x‐rays in crystals distorted by a strain gradient whose magnitude is characterized by a parameter β are presented. It is shown how the new wavefield that appears when βΓ (Γ being the classical extinction length) is much larger than 1 pumps intensity out of the normal wavefield, which explains the transition from the dynamical to the kinematical theory. The quantity βΓ can be increased either by increasing the distortion or by using smaller wavelengths or structure factors as checked experimentally on Si 1‐x Ge x crystals.