Hemispherical Laue camera

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863635

Li, James C. M. ^[1]; Chu, Sungnee G ^[2]

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1. Pittsford, NY
2. Rochester, NY

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.

• Research Organization: Univ. of Rochester, NY (United States)
• DOE Contract Number: EY-76-S-02-2296
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4217493
• OSTI ID: 863635
• Country of Publication: United States
• Language: English

Related Subjects

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
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