![]() However, the diffraction and the goniometer angles should be different, The diffraction angle should coincide with the goniometer angle. If both the incident and diffracted x-ray beams are horizontal in the above figure, More precisely, the effects of the x-ray having slightly different wavelength from the peak wavelength can be expressed as the following instrumental function. The most significant effect of the instrument is the splitting of each diffraction peak into Kα 1 and Kα 2 lines. Since the CuKα line is usually used as the x-ray source in powder diffractometry, The above effects are modelled through analytic geometry. spectroscopic profile of the specific x-ray.It is known that significant deformation of observed diffraction peak profile is caused by The errors of the insrument have already been studied in detail. Since Bragg-Brentano diffractometers have been used for a long time, The configuration of the Bragg-Brentano diffractometer is very simple as illustrated above,īut the lattice constants can be determined at the precision of five siginificant numbers The instrumental function of an instrument may not be applicable to another instrument.įortunately, there is a common design widely used for powder diffractometers. Since the instrumental function varies on which instrument is used, The observed peak profile is usually considered to be expressed as the convolution of the intrinsic peak profile with the instrumental function. Then, how should we consider the effect of the instrument? It is necessary to take into account the effects of the instrument correctly, for precise evaluation of structures from powder diffraction data. Powder X-ray diffraction peak profile varies on instruments and conditions of measurements. Introduction Instrumental function of a Bragg-Brentano diffractometerĪ precise mathematical formula of the instrumental function of Bragg-Brentano diffractometer Instrumental function of Bragg-Brentano diffractometer ![]()
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