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Core CIF Dictionary version 2.3

_exptl_crystal_F_000

Name

'_exptl_crystal_F_000'

Category: exptl_crystal

Data type: numb

May appear in a looped list containing '_exptl_crystal_id'

Enumeration range: 0.0 -> infinity

Definition

    	
   The effective number of electrons in the crystal unit cell
   contributing to F(000). It may contain dispersion contributions,
   and is calculated as

   F(000) = [ (sum f~r~)^2^ + (sum f~i~)^2^ ]^1/2^

   f~r~   = real part of the scattering factors at theta = 0
   f~i~   = imaginary part of the scattering factors at theta = 0

            the sum is taken over each atom in the unit cell
 


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