Patent ID: 7116753

Claim:
Method for determination of elastic strain present in single-crystal wafers, in which a tested single-crystal wafer is illuminated with an X-ray beam, registration of an interference pattern of diffraction is performed, and relative position of interference maxima is determined and used to judge the presence of elastic strain, wherein: the single-crystal wafer is illuminated with a converging X-ray beam having a point of ray intersection inside said single-crystal wafer or on a side opposite to that on which said converging X-ray beam falls, said converging X-ray beam has angular convergence sufficient for providing diffraction conditions simultaneously for multiple crystallographic planes; and the determination of relative position of the interference maxima is performed for diffraction reflections from crystallographic planes having different indices of the form of nKK, where n is equal to H, K, or L and differs for distinct crystallographic planes, by utilizing one or several position-sensitive X-ray detectors.