Hemispherical laue camera

Details Hemispherical laue camera Hemispherical laue camera

G - Physics

01

N

358/12, 358/5

G01N 23/205 (2006.01)

Patent

CA 1131804

HEMISPHERICAL LAUE CAMERA ABSTRACT A hemispherical Laue camera comprises a crystal sample mount for positioning a sample to be analyzed at the center of sphere of a hemispherical, X-radiation sensitive film cassette, a collimator, a stationary or rotating sample mount and a set of standard spherical projection spheres. X- radiation generated from an external source is directed through the collimator to impinge onto the single crystal sam- ple on the stationary mount. The diffracted beam is recorded on the hemispherical X-radiation sensitive film mounted inside the hemispherical film cassette in either transmission or back-reflection geometry. The distances travelled by X- radiation diffracted from the crystal to the hemispherical film are the same for all crystal planes which satisfy Bragg's Law. The recorded diffraction spots or Laue spots on the film thereby preserve both the symmetry information of the crystal structure and the relative intensities which are directly re- lated to the relative structure factors of the crystal orientations. The diffraction pattern on the exposed film is compared with the known diffraction pattern on one of the standard spherical projection spheres for a specific crystal structure to determine the orientation of the crystal sample. By replacing the stationary sample support with a rotating sam- ple mount, the hemispherical Laue camera can be used for crystal structure determination in a manner previously pro- vided in conventional Debye-Scherrer cameras.

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