Commission on Neutron Scattering (CNS)
- M. Steiner (Chair, Germany)
- V.L. Aksenov (Russia)
- R. Bau (USA)
- M.M.R. Costa (Portugal)
- M.T. Fernandez-Diaz (Spain)
- T. Kamiyama (Japan)
- S.J. Kennedy (Australia)
- K. Lefmann (Denmark)
- R.L. McGreevy (UK)
- A. Venter (South Africa)
Terms of Reference
The Commission on Neutron Diffraction was established at the Moscow
General Assembly in 1966. The proposal at that time is given below.
The Commission on Neutron Diffraction shall be concerned with those
aspects of crystallography which can be studied almost uniquely by using
neutron beams. Broadly these fall into three classes:
It is considered that there are several ways in which these aims can be
directly advanced and that there is a substantial need for action at the
present time in these various directions.
- Satisfactory detection of light atoms (particularly hydrogen)
- The detection and description of magnetic architecture
- The study of crystal dynamics from inelastic scattering data
- Tabulation and critical evaluation of data on the neutron
scattering amplitudes of elements and isotopes, including complex
scattering amplitudes, and of magnetic form factors. There are wide
variations of accuracy among the accepted values and the accuracies of
many of them are not known.
- Collection of information and recommendations on technical
procedures, e.g. choice of initial collimation, the uses of
Soller slits, choice and availability of monochromators, corrections for
secondary extinction, multiple scattering and series termination.
- Cataloguing of information on reactor types, neutron flux,
background, instrumentation, methods of data collection and handling,
design of cryostats and magnet assemblies.
- Encouragement of monographs, e.g. on Shubnikov groups, and
their application to the determination of magnetic structures, inelastic
scattering techniques. Cooperation in the production of Structure
Reports for the description of magnetic structures.
- Support for symposia, in particular to ensure that the various
aspects of neutron diffraction techniques, such as those mentioned
above, get adequate coverage in meetings of the International Union of
Crystallography. This need is quite distinct from providing coverage of
the results of neutron-diffraction investigations.
© International Union of Crystallography