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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
_atom_type_scat.exponential_polynomial_coefs
Name:_atom_type_scat.exponential_polynomial_coefs
Definition:
The set of polynomial coefficients for generating X-ray scattering factors:
[ a_0, a_1, ... , a_N ].
f(s; Z) = exp[Sum(a~i~ * s^i^), i=0:N]
where s = (sin θ)/λ, θ is the diffraction angle and λ is the wavelength
of the incident radiation in angstroms.
Reference: Thorkildsen, G. (2023). Acta Cryst. A79, 318–330.
Type: Real
Values appear in List context.
Dimension: []
Units: unspecified
Category:
atom_type_scat
