Patent ID: 8787525

Claim:
An X-ray monochromator comprising: a substrate having a curved surface with a radius of curvature twice that of a Rowland circle; and an inorganic oxide film formed on the curved surface and having a plurality of pores, wherein the plurality of pores are laid periodically in a stacked manner in the inorganic oxide film, and have a structural period in a direction normal to the curved surface, wherein the plurality of pores are spherical, and wherein a first symmetric reflection plane includes axes of rotation (n=6) for a plurality of pores in a first region of the inorganic oxide film and is disposed perpendicular to the surface of the inorganic oxide film, and wherein a second symmetric reflection plane includes axes of rotation (n=6) for a plurality of pores in a second region of the inorganic oxide film, is disposed perpendicular to the surface of the inorganic oxide film, and is not parallel to the first symmetric reflection plane.