|
International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by J. R. Hester and B. McMahon © International Union of Crystallography 2026 |
International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011 Chapter 4.2 Core dictionary (coreCIF) |
Core dictionary version 3.3.0
_atom_type.mass_number
Name:_atom_type.mass_number
Definition:
Mass number of this atom type.
Used to denote a specific isotope. Special value '.' indicates
that the element is present in natural isotopic abundance.
Type: Integer
Units: none
The permitted range is 1 → infinity
Category:
atom_type
