Geometrical aspects of real-time powder diffraction using a normal generator and a linear diode-array detector

A real-time powder diffractometer has been constructed, with which it is possible to follow structural changes taking place in a specimen in min or even seconds. Arrangements are available to control and change the temperature of the sample in the diffractometer. A formula describing the line width resulting from the non-conventional geometry has been derived. This formula can be used for tuning the equipment to meet practical requirements. Experiments to assess this formula are presented.