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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
_diffrn_source.convergence_angle
Name:_diffrn_source.convergence_angle
Definition:
The angle of convergence of the source beam (for example in
convergent-beam electron diffraction). The convergence angle
is the angular spread of the cone of illumination (i.e. 2α,
where the semi-angle α is measured from the axis defining the
beam direction).
Type: Real
Units: degrees
The permitted range is 0.0 → infinity
Category:
diffrn_source
