Patent ID: 7680246

Claim:
A method for judging a polarity of a single crystal sample, the method comprising the step of: (a) preparing a single crystal sample ( 18 ), which consists of plural elements and has a polarity; (b) preparing an X-ray source ( 10 ), which can generate X-rays in a predetermined wavelength range including an absorption edge of any one of the plural elements; (c) allowing a divergent X-ray beam ( 12 ) emitted from the X-ray source to be reflected by a parabolic multilayer mirror ( 14 ) to make a parallel beam that includes the X-rays in the predetermined wavelength range; (d) allowing the parallel beam, which is used as an incident X-ray beam, to be incident on the single crystal sample, and thereafter detecting an intensity of a diffracted X-ray beam ( 20 ) coming from the single crystal sample with an X-ray detector ( 22 ); (e) measuring a wavelength dependence of the intensity of diffracted X-ray beam in the wavelength range including the absorption edge of any one of the plural elements by synchronously scanning a rotation on angle ω of the single crystal sample to the incident X-ray beam and an angle 2θ between the incident X-ray beam and the diffracted X-ray beam with an angular speed ratio of 1 to 2; and (f) acquiring a ratio of the intensity of diffracted X-ray beam shorter in wavelength than the absorption edge to the intensity of diffracted X-ray beam longer in wavelength than the absorption edge, and thereafter judging the polarity on a basis of a value of the ratio of intensity.