Protein Data Bank exchange dictionary (pdbx) version 1.017

_diffrn_radiation.pdbx_analyzer

Name:
'_diffrn_radiation.pdbx_analyzer'

Definition:

   Indicates the method used to obtain monochromatic radiation.
  _diffrn_radiation.monochromator describes the primary beam
  monochromator (pre-specimen monochromation). 
  _diffrn_radiation.pdbx_analyzer specifies the
  post-diffraction analyser (post-specimen) monochromation.
  Note that monochromators may have either 'parallel' or
  'antiparallel' orientation. It is assumed that the
  geometry is parallel unless specified otherwise.
  In a parallel geometry, the position of the monochromator
  allows the incident beam and the final post-specimen
  and post-monochromator beam to be as close to parallel
  as possible. In a parallel geometry, the diffracting
  planes in the specimen and monochromator will be parallel
  when 2*theta(monochromator) is equal to 2*theta (specimen).
  For further discussion see R. Jenkins and R. Snyder,
  Introduction to X-ray Powder Diffraction, Wiley (1996),
  pp. 164-5.

Examples:

GE(111)

'Zr filter'

'Ge 220'

none

'equatorial mounted graphite (0001)'

'Si (111), antiparallel'

Type: text

Mandatory item: no

Alias:
_pd_instr_monochr_post_spec (cif_pd.dic version 1.0)

Category: diffrn_radiation