Powder dictionary (pdCIF) version 1.0.1

_pd_spec_orientation

Name:
'_pd_spec_orientation'

Definition:

   The orientation of the \w (\q) and 2\q axis.
   Note that this axis is parallel to the specimen axial axis
   and perpendicular to the plane containing the incident and
   scattered beams.

   Thus for a horizontal orientation, scattering
   measurements are made in a plane perpendicular to the
   ground (the 2\q axis is parallel to the ground);
   for vertical orientation, scattering measurements are
   made in a plane parallel with the ground (the 2\q axis
   is perpendicular to the ground). `Both' is appropriate for
   experiments where measurements are made in both planes,
   for example using two-dimensional detectors.

The data value must be one of the following:

horizontal

vertical

both

Type: char

Category: pd_spec

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