X-ray or gamma ray systems or devices – Specific application – Diffraction – reflection – or scattering analysis
Patent
1989-01-03
1989-11-21
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Specific application
Diffraction, reflection, or scattering analysis
378 85, C21K 106
Patent
active
048827800
ABSTRACT:
A doubly-curved crystal for use in a scanning monochromator is oriented with respect to a reference plane containing source and image locations of the monochromator. The crystal has concave planes of lattice points and a concave crystal surface which satisfy Johannson geometric conditions within the reference plane for a Rowland circle of radius R. The planes of lattice points are substantially spherically curved to a radius of 2R, and the crystal surface is substantially toroidally curved with a radius of substantially 2R within a plane perpendicular to the reference plane. The crystal may be formed by plastically deforming a cylindrically curved crystal blank over a doubly-curved convex die.
REFERENCES:
patent: 3546453 (1970-12-01), Browning
patent: 3914605 (1975-10-01), Hara
patent: 4446568 (1984-05-01), Williams
patent: 4599741 (1986-07-01), Wittry
patent: 4649557 (1987-03-01), Hornstra et al.
patent: 4807268 (1989-02-01), Wittry
R. W. James, "The Optical Principles of the Diffraction of X-Rays", The Crystalline State, Vol. II, pp. 268-305 (1958).
Fields Carolyn E.
Porter David P.
University of Southern California
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