Homework SourseSome diffraction lines are forbidden by structure factor cal
Some diffraction lines are forbidden by structure factor calculations (and are missing from Cullity\'s Appendix \"Quadratic Forms of Miller Indices\") but can sometimes be seen in diffraction patterns. Describe two unrelated causes for such forbidden lines.
Solution
Causes:
The cause for forbidden line ,it often reveals a central line of absent intensity caused by dynamical diffraction.It is caused by c-glide plane that is parallel to the electron beam diffraction
The lines becomes narrower as the crystal thickness increases.
![Some diffraction lines are forbidden by structure factor calculations (and are missing from Cullity\'s Appendix \](/WebImages/12/some-diffraction-lines-are-forbidden-by-structure-factor-cal-1010422-1761521517-0.webp "Some diffraction lines are forbidden by structure factor calculations (and are missing from Cullity\'s Appendix \")
