9) 30 Marks The XRD pattern obtained for caesium chloride (CCI) using a powder diffractometer with Cuka radiation () = 0.1542 nm) is given below along with the diffraction angles of the peaks. It is known that CsCl belongs to the cubic crystal system and the peaks in the XRD pattern have been identified (indexed). Courts 011 2000 Peak (001) (011) (111) (002) 20 21.55 30.69 37.86 43.98 1500 1000 500 001 002 40 Diffraction Angle 20 a) With the aid of a sketch, state the main components and show their arrangement in a powder X- ray diffractometer. With reference to the basic geometry of the instrument, explain how a diffraction pattern is produced from a powdered sample. Why is monochromatic radiation used? 10 marks