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Powder dictionary (pdCIF) version 1.0.1




   Length of the specimen that is illuminated by the radiation
   source (in millimetres).

   Use _pd_instr_cons_illum_len for instruments where
   the illumination length does not vary with 2\q, by
   adjustment of the divergence slits (sometimes known
   as \q-compensated slits).
   Use _pd_instr_var_illum_len for instruments where
   the illuminated length of the specimen has been 
   characterized as a function of 2\q, most commonly true
   with a fixed divergence slit.

The permitted range is 0.0 -> infinity

Type: numb

Category: pd_instr