Data Item _diffrn_radiation.div_y_source
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General 
- Item name
- _diffrn_radiation.div_y_source
- Category name
- diffrn_radiation
- Attribute name
- div_y_source
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
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 (estimated standard deviation,
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.
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating point numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
- Default value
- 0.0
- Units
- degrees