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Figure 1
Time–length (tλ) and energy–momentum (Q) space of excitations relevant in condensed matter. The figure indicates how different domains are accessed by different inelastic scattering probes: neutrons (INS), X-rays (IXS), ultraviolet (IUVS) and Brillouin light scattering (BLS). The ultra-high-resolution IXS (UHRIX) spectrometer presented by Shvyd'ko et al. (2014BB42) entered the previously inaccessible region marked in shaded green. The novel capabilities discussed in the present paper will enable IXS experiments with 0.1 meV and 0.02 nm−1 resolution in the region marked in shaded light green. Hence, they will close the existing gap between the high-frequency and low-frequency probes. The energy  = Ef-Ei and the momentum [{\bf{Q}}] = [{\bf{k}}_{\rm{f}}-{\bf{k}}_{\rm{i}}] transfers from initial to final photon/neutron states are measured in inelastic scattering experiments, as schematically shown in the inset.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 2| March 2016| Pages 410-424
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