The X-rays from synchrotron: New challenge for neutron scattering

Current developments in X-ray scattering techniques at synchrotron radiation facilities are reviewed. Highly collimated, intense white radiations open up new areas of research in condensed matter physics and challenge the traditional domains of neutron scattering. These include energy dispersive scattering, the use of anomalous dispersion, magnetic diffraction and direct energy analysis by backscattering. The relative merits of X-ray and neutron scattering techniques are discussed. The advantage of neutron scattering is the capability of performing polarization analysis. Developments at Brookhaven in inelastic scattering of polarized neutrons are discussed as well as special technical problems associated with the search for phasons utilizing a high resolution triple axis spectrometer.