It is implemented in the Python programming language and runs therefore on both Windows and Linux. However, several open source software packages are also available: GenX is a commonly used open source X-ray reflectivity curve fitting software. The drawback of this 2-norm in logarithmic space is that it may give too much weight to regions where relative photon counting noise is high.ĭiffractometer manufacturers typically provide commercial software to be used for X-ray reflectivity measurements. This 2-norm in logarithmic space can be generalized to p-norm in logarithmic space. Needless to say, in the equation data points with zero measured photon counts need to be removed. When an interface is not perfectly sharp, but has an average electron density profile given by ρ e ( z ). Parratt's initial work explored the surface of copper-coated glass, but since that time the technique has been extended to a wide range of both solid and liquid interfaces. The technique appears to have first been applied to X-rays by Lyman G. The deviations can then be analyzed to obtain the density profile of the interface normal to the surface. If the interface is not perfectly sharp and smooth then the reflected intensity will deviate from that predicted by the law of Fresnel reflectivity. The basic principle of X-ray reflectivity is to reflect a beam of X-rays from a flat surface and to then measure the intensity of X-rays reflected in the specular direction (reflected angle equal to incident angle).
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