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<title>(IUCr) CIF Definition save__diffrn_radiation.polarizn_source_norm</title>
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<p class="title">DRAFT DICTIONARY</p>
<p class="title"><font class="smalltitle"></font>CBF/imgCIF Extensions Dictionary</p>
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<p class="title">Draft version 1.5 for comment</p>
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<h5>Image dictionary (imgCIF) version 1.5.4</h5>
<h1>_diffrn_radiation.polarizn_source_norm</h1><b>Name:</b><br /><tt class="cifdefinition">'_diffrn_radiation.polarizn_source_norm'</tt>
<p><b>Definition:</b></p><pre class="cifdefinition">
The angle in degrees, as viewed from the specimen, between
the normal to the polarization plane and the laboratory Y
axis as defined in the AXIS category.
Note that this is the angle of polarization of the source
photons, either directly from a synchrotron beamline or
from a monochromater.
This differs from the value of
<a href="Idiffrn_radiation.polarisn_norm.html" class="itemlink">_diffrn_radiation.polarisn_norm</a>
in that <a href="Idiffrn_radiation.polarisn_norm.html" class="itemlink">_diffrn_radiation.polarisn_norm</a> refers to
polarization relative to the diffraction plane rather than
to the laboratory axis system.
In the case of an unpolarized beam, or a beam with true
circular polarization, in which no single plane of
polarization can be determined, the plane should be taken
as the XZ plane and the angle as 0.
See <a href="Idiffrn_radiation.polarizn_source_ratio.html" class="itemlink">_diffrn_radiation.polarizn_source_ratio</a>.
</pre>
<p><b>Type:</b> float</p>
<p class="pack"><b>Mandatory item:</b> no</p>
<br />The permitted range is [-90.0, 90.0]<br />
<br />Enumeration default: </b>0.0
<p class="pack"><b>Category:</b> <a href="Cdiffrn_radiation.html" class="catlink">diffrn_radiation</a></p>
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HTML version of draft dictionary created by modified version of makedicthtml by B. McMahon
from modified version of imgCIF dcitionary 1.3.2 which is subject to the following copyright:
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