Data Item _refine.ls_extinction_coef

General

Item name
_refine.ls_extinction_coef
Category name
refine
Attribute name
ls_extinction_coef
Required in PDB entries
no
Used in currrent 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]+)?

Aliases

Alias Item Name Dictionary Name Dictionary Version
_refine_ls_extinction_coef cif_core.dic 2.0.1