[IUCr Home Page] [CIF Home Page]


Image dictionary (imgCIF) version 1.3.2




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

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

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

   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