Patent Number: 
Section: claims

1. An X-ray diffraction apparatus comprising:a soller slit having a plurality of thin plates, each thin plate being perpendicular to a bottom surface and arcuately arranged with a predetermined angular interval between each other so as to pass X-rays in a radiating direction from a particular focus, the soller slit being provided at a position through which X-rays diffracted on a sample surface pass, the particular focus being the center of a goniometer circle, the sample being irradiated with the X-rays at an angle for GIXD (Grazing Incident X-ray Diffraction);an X-ray source configured to irradiate line-focused X-rays on the sample;an in-plane arm rotatably provided relative to the center of the goniometer circle; anda photon-counting two dimensional detector provided on the in-plane arm and configured to detect diffracted X-rays which have passed through the soller slit, whereinthe soller slit is provided at a position through which X-rays diffracted on a crystal lattice plane perpendicular to the sample surface in the sample pass and a position where a diffraction angle resolution of the diffracted X-rays is depended on, a resolution in an in-plane direction of the soller slit being equal to or lower than 1°, the particular focus being the center of the goniometer circle, the X-rays being irradiated on the sample at an angle for GIXD (Grazing Incident X-ray Diffraction), andthe X-ray diffraction apparatus detects the diffracted X-rays with driving the in-plane arm. 2. The X-ray diffraction apparatus according to claim 1, further comprising:a TDI control unit configured to calculate a detected X-ray intensity on a detected position in space, in accordance with the detected position of the X-ray intensity on the detector and the rotation angle of the in-plane arm. 3. The X-ray diffraction apparatus according to claim 1, further comprising:a swing mechanism having the soller slit to allow the soller slit to swing with the particular focus as a center. 4. The X-ray diffraction apparatus according to claim 1, further comprising:a sample table that rotatably supports the sample around an axis perpendicular to the sample surface, whereinthe sample table is rotated in accordance with the rotation of the in-plane arm, and the sample is rotated around an axis perpendicular to the sample surface. 5. The X-ray diffraction apparatus according to claim 1, further comprising:a multilayer mirror that shapes the X-rays to be irradiated in a monochromatic and parallel beam, andan in-plane PSC that increase the parallelism of the shaped X-rays. 6. A method of measuring diffracted X-rays using a soller slit having a plurality of thin plates, each thin plate being perpendicular to a bottom surface and arcuately arranged with a predetermined angular interval between each other so as to pass X-rays in a radiating direction from a particular focus, the soller slit being provided at a position through which X-rays diffracted on a crystal lattice plane perpendicular to the sample surface in the sample pass and a position where a diffraction angle resolution of the diffracted X-rays is depended on, a resolution in an in-plane direction of the soller slit being equal to or lower than 1°, the particular focus being the center of a goniometer circle, the sample being irradiated with the X-rays at an angle for GIXD (Grazing Incident X-ray Diffraction);the method comprising:a step of providing the soller slit at a position through which X-rays diffracted on a sample surface pass, the particular focus being the center of a goniometer circle; anda step of irradiating line-focused X-rays on the sample at an angle for GIXD (Grazing Incident X-ray Diffraction), and detecting X-rays diffracted by the sample, with a photon-counting two-dimensional detector via the soller slit in accordance with the rotation of the in-plane arm rotatably provided relative to the center of the goniometer circle.