Routines for Polarised Neutron Scattering
The library contains some programs and subroutines specially written to treat
polarised neutron diffraction data.
The main programs are:
- SORGAM
- A program to calculate magnetic structure factors
from polarised neutron flipping ratios.
- ARRSNP
- A program to group together equivalent measurements of elements
of polarisation matrices and give some statistics
on their degree of equivalence, indices may be submultiples of integers.
- ARISNP
- A program similar to ARRSNP but for reflections with incomensurate indices
- AVEXAR
- Reads the ARRNGEd SNP data from either ARRSNP or ARISNOP and calculates mean values of polarisation matrix
components averaged over those which should be equivalent.
- PALSQ
- Least squares refinement of magnetic structures using scattered
polarisations obtained with spherical neutron polarimetry (general input polarisation directions.)
- SNPSQ
- Least squares refinement of magnetic structures using elements
of the polarisation matrix which may be combined with other types of data
such as intensity measurements.
Some special subroutines are:
- CALGAM
- Solves the quadratic equation for gamma (the ratio of the magnetic to
the nuclear structure factor) in terms of the flipping ratio.
- CALPOL
- Calculates scattered polarisations and their derivatives for
structures which may have mixed magnetic and nuclear reflections.
- FGAMMA
- Calculates gamma, and its standard deviation from a flipping ratio
measurement.
- GAMEX
- Calculates an extinction corrected gamma from a flipping ratio.
- SETPOL
- Reads the up and down polarisations of a polarised neutron beam.
P.J. Brown - Institut Laue Langevin, Grenoble, FRANCE.