Photons and neutrons
A review is given of two selected topics in current activities of synchrotron x-ray studies; magnetic x-ray scattering and inelastic x-ray scattering. These are the research areas where photons and neutrons directly compete and supplement each other. A great deal of progress has been made in the field of magnetic x-ray scattering with synchrotron radiation. A series of high resolution studies on Ho and other rare earth magnetic structures has revealed many important features of spin arrangements, which escaped clarification by previous neutron diffraction studies. Magnetic x-ray scattering recently entered into its next stage of development when the resonance at the absorption edge was shown to enhance the Ho magnetic cross section by a factor of 50. The second area where x-ray scattering is beginning to overlap with neutron research is direct inelastic x-ray scattering. Because of its favorable energy-wavelength relation, neutron scattering has been the natural tool for the direct observation of elementary excitations in condensed matter. The most commonly used neutrons have 14 meV of energy and a 2.3{angstrom} in wavelength. The energy of x-rays with the same wavelength is 5 KeV. In order to attain a sufficient energy resolution for phonon studies, one has to use backscattering from a perfect crystal. This type of experimental arrangement became feasible recently because of the brightness of x-rays emitted by synchrotron and storage rings. 9 refs., 3 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5832232
- Report Number(s):
- BNL-45993; CONF-9010243-17; ON: DE91010980
- Resource Relation:
- Conference: International collaboration on advanced neutron sources (ICANS), Tsukuba (Japan), 21-26 Oct 1990
- Country of Publication:
- United States
- Language:
- English
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656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)