Image dictionary (imgCIF) version 1.3.2
Polarization ratio of the diffraction beam incident on the crystal. This is the ratio of the perpendicularly polarized to the parallel polarized component of the radiation. The perpendicular component forms an angle of _diffrn_radiation.polarisn_norm to the normal to the diffraction plane of the sample (i.e. the plane containing the incident and reflected beams).
Mandatory item: noAlias:
_diffrn_radiation_polarisn_ratio (cif_core.dic version 2.0.1)
The permitted range is [0.0, infinity)