Index

Image dictionary (imgCIF) version 1.3.2

_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 pi.

Type: float

Mandatory item: no

Category: diffrn_radiation