**Definition:**

The reciprocal cell length (recip-b) in inverse Angstroms. (recip-a), (recip-b) and (recip-c) are related to the real cell by the following equation: recip-a = b*c*sin(alpha)/V recip-b = c*a*sin(beta)/V recip-c = a*b*sin(gamma)/V where V is the cell volume. Ref: Buerger, M. J. (1942). X-ray Crystallography, p. 360. New York: John Wiley & Sons Inc.

**Type:** float

**Type conditions:** esd

**Mandatory item:** no

The permitted range is [0.0, infinity)

**Related item: **_cell.reciprocal_length_b_esd (associated_esd)

**Category:** cell

Copyright © 2005 International Union of Crystallography