Index

Macromolecular dictionary (mmCIF) version 2.0.09

_cell.reciprocal_angle_alpha

Name:
'_cell.reciprocal_angle_alpha'

Definition:

   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.

Type: float

Type conditions: esd

Mandatory item: no

Alias:
_cell_reciprocal_angle_alpha (cif_core.dic version 2.3)
The permitted range is [0.0, 180.0]

Related item: _cell.reciprocal_angle_alpha_esd (associated_esd)

Enumeration default: 90.0

Category: cell