| DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment | 
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Definition:
        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).
Type: float
Mandatory item: no
Alias:Category: diffrn_radiation
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