Data Item _diffrn_radiation.div_y_source

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