Data Item _cell.reciprocal_angle_alpha

General

Item name
_cell.reciprocal_angle_alpha
Category name
cell
Attribute name
reciprocal_angle_alpha
Required in PDB entries
no
Used in current PDB entries
Yes, in about 0.001 % of entries

Item Description

The angle (recip-alpha) defining the reciprocal cell in degrees. (recip-alpha), (recip-alpha) and (recip-alpha) related to the angles in the real cell by: cos(recip-alpha) = [cos(beta)*cos(gamma) - cos(alpha)]/[sin(beta)*sin(gamma)] cos(recip-beta) = [cos(gamma)*cos(alpha) - cos(beta)]/[sin(gamma)*sin(alpha)] cos(recip-gamma) = [cos(alpha)*cos(beta) - cos(gamma)]/[sin(alpha)*sin(beta)] Ref: Buerger, M. J. (1942). X-ray Crystallography, p. 360. New York: John Wiley & Sons Inc.

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]+)?
Default value
90.0
Units
degrees

Allowed Boundary Conditions

Minimum Value Maximum Value
0.0 180.0

Aliases

Alias Item Name Dictionary Name Dictionary Version
_cell_reciprocal_angle_alpha cif_core.dic 2.3