Patent ID: 6999557

Claim:
In a method of obtaining reciprocal-space mapping of X-ray diffraction having the steps of: preparing a first angular variable and a second angular variable both of which define a relative angular location among an incident X-ray, a sample and a diffracted X-ray; changing the first angular variable so that a magnitude of a scattering vector of X-ray diffraction is changed with a direction of the scattering vector kept constant to produce a first condition-change; changing the second angular variable so that the direction of the scattering vector is changed with the magnitude kept constant to produce a second condition-change; combining the first condition-change with the second condition-change so as to make a plurality of the scattering vectors which are included in a desired measuring region surrounding a predetermined target point in a reciprocal space; and carrying out X-ray diffraction measurement for the plurality of the scattering vectors so as to make the reciprocal-space mapping, a method of setting measuring ranges of the reciprocal-space mapping comprising the steps of: (a) determining whether a designated range of the second angular variable is a relative-angle-designated range on a basis of the target point or an absolute-angle-designated range; (b) acquiring the relative-angle-designated range as an allowable range of the second angular variable when the determining step determines the relative-angle-designated range, or converting the absolute-angle-designated range into the relative-angle-designated range and acquiring the thus-converted relative-angle-designated range as an allowable range of the second angular variable when the determining step determines the absolute-angle-designated range; and (c) acquiring any one of a relative-angle-designated range and an absolute-angle-designated range as an allowable range of the first angular variable.