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Protein Data Bank exchange dictionary (pdbx) version 1.0521
_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