Data Item _refine.ls_extinction_coef
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General 
- Item name
- _refine.ls_extinction_coef
- Category name
- refine
- Attribute name
- ls_extinction_coef
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
The extinction coefficient used to calculate the correction
factor applied to the structure-factor data. The nature of the
extinction coefficient is given in the definitions of
_refine.ls_extinction_expression and
_refine.ls_extinction_method.
For the 'Zachariasen' method it is the r* value; for the
'Becker-Coppens type 1 isotropic' method it is the 'g' value,
and for 'Becker-Coppens type 2 isotropic' corrections it is
the 'rho' value. Note that the magnitude of these values is
usually of the order of 10000.
Ref: Becker, P. J. & Coppens, P. (1974). Acta Cryst. A30,
129-47, 148-153.
Zachariasen, W. H. (1967). Acta Cryst. 23, 558-564.
Larson, A. C. (1967). Acta Cryst. 23, 664-665.
Item Example
3472
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _refine.ls_extinction_coef_esd | associated_esd |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _refine_ls_extinction_coef | cif_core.dic | 2.0.1 |