DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment

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Index

##### Image dictionary (imgCIF) version 1.5.4

# _diffrn_radiation.div_y_source

Name:
`'_diffrn_radiation.div_y_source'`

Definition:

            Beam crossfire in degrees parallel to the laboratory Y axis
                   (see AXIS category).

                   This is a characteristic of the X-ray beam as it illuminates
                   the sample (or specimen) after all monochromation and
                   collimation.

                   This is the standard uncertainty (e.s.d.) of the directions
                   of photons in the YZ plane around the mean source beam
                   direction.

                   Note that for some synchrotrons this value is specified
                   in milliradians, in which case a conversion is needed.
                   To convert a value in milliradians to a value in degrees,
                   multiply by 0.180 and divide by \p.

Type: float

Mandatory item: no

Enumeration default: 0.0

Category: diffrn_radiation

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Copyright © 2005 International Union of Crystallography