Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1979-06-04
1980-08-12
Church, Craig E.
Radiant energy
Coded record and readers; invisible radiant energy type
250273, 250275, G01N 2320
Patent
active
042174937
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 sample 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 related 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 sample mount, the hemispherical Laue camera can be used for crystal structure determination in a manner previously provided in conventional Debye-Scherrer cameras.
REFERENCES:
patent: 3764809 (1973-10-01), Haas
"New Conical Camera for Single Crystal Orientation by Means of X-Rays", Arguello, Review of Scientific Instruments, vol. 38, No. 5, May, 1967, pp. 598-600.
Chu Sung-nee G.
Li James C. M.
Belkin Leonard
Church Craig E.
Cornish Cornell D.
Lupo R. V.
The United States of America as represented by the United States
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