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Title: 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 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 cameramore » can be used for crystal structure determination in a manner previously provided in conventional Debye-Scherrer cameras.« less

Inventors:
 [1];  [2]
  1. (Pittsford, NY)
  2. (Rochester, NY)
Issue Date:
Research Org.:
Rochester Univ., NY (USA)
OSTI Identifier:
863635
Patent Number(s):
4217493
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
EY-76-S-02-2296
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
hemispherical; laue; camera; comprises; crystal; sample; mount; positioning; analyzed; center; sphere; x-radiation; sensitive; film; cassette; collimator; stationary; rotating; set; standard; spherical; projection; spheres; generated; external; source; directed; impinge; single; diffracted; beam; recorded; mounted; inside; transmission; back-reflection; geometry; distances; travelled; planes; satisfy; bragg; law; diffraction; spots; preserve; symmetry; information; structure; relative; intensities; directly; related; factors; orientations; pattern; exposed; compared; specific; determine; orientation; replacing; support; determination; manner; previously; provided; conventional; debye-scherrer; cameras; directly related; mounted inside; crystal plane; crystal planes; radiation generated; single crystal; crystal structure; diffraction pattern; external source; radiation sensitive; sensitive film; sample mount; camera comprises; diffracted beam; crystal orientation; film cassette; laue camera; hemispherical laue; /378/

Citation Formats

Li, James C. M., and Chu, Sungnee G. Hemispherical Laue camera. United States: N. p., 1980. Web.
Li, James C. M., & Chu, Sungnee G. Hemispherical Laue camera. United States.
Li, James C. M., and Chu, Sungnee G. Tue . "Hemispherical Laue camera". United States. https://www.osti.gov/servlets/purl/863635.
@article{osti_863635,
title = {Hemispherical Laue camera},
author = {Li, James C. M. and Chu, Sungnee G.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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