X-ray Propagation in Distorted Crystals: From Dynamical to Kinematical Theory

✍ Scribed by C. Malgrange

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 300 KB
• Volume: 37
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/1521-4079(200207)37:7<654::aid-crat654>3.0.co;2-e

✦ Synopsis

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 βΛ (Λ 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 βΛ 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.