Abstract
Based on an experimental result on disappearance of the Laue spots of the downward x-ray diffraction (2 θB∼90°. Hereafter, abbreviated as DXD.) in solid helium a radically modified Debye-Waller factor and a modified Bragg law, considering the recoil scattering and its Doppler effect, could be obtained. Since kBΘD≪ER (recoil energy) in solid helium in contrast with the reverse inequality in almost all materials, the fraction of recoil-free diffraction is extremely less than one which is one of main causes of disappearance of the Laue spots of the DXD. The difference of wave-length in Pendelloesung beat 1.4 · 10−6 Aby using Kato-Lang’s fomula from the (200) plane in GaAs which occurs by slight frequency shifts of incident X-ray becomes in order of 0.5· 10−6 A derived from a modified Bragg law. This agrees very well with the experimental values of GaAs [1].
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
