Data Item _exptl_crystal.F_000
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General 
- Item name
- _exptl_crystal.F_000
- Category name
- exptl_crystal
- Attribute name
- F_000
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
The effective number of electrons in the crystal unit cell
contributing to F(000). This may contain dispersion contributions
and is calculated as
F(000) = [ sum (fr2 + fi2) ]1/2
fr = real part of the scattering factors at theta = 0 degree
fi = imaginary part of the scattering factors at
theta = 0 degree
the sum is taken over each atom in the unit cell
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- [+-]?[0-9]+
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 1 | +∞ |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _exptl_crystal_F_000 | cif_core.dic | 2.0.1 |