Answer Happy

A single crystal of jadeite is irradiated with Cu Ka X-rays (wavelength = 1.54 Å) along the a axis, in a static configuration. Demonstrate diagrammatically that the Ewald sphere for this wavelength intersects the reciprocal lattice point 002, and show that the 008 reciprocal lattice point could never satisfy the Bragg diffraction condition for this wavelength. [6] Crystal diffraction experiments can be carried out by using neutrons, electron and X- rays. Consider a single crystal diffraction experiment on the jadeite crystal using electrons accelerated at 300 kV (wavelength = 2.24 pm) and X-rays (wavelength -100 pm), incident on the same direction. Using this information, discuss how the Ewald sphere will change in each case and how different the resulting diffraction patterns will be [4]