Ultra-high-resolution inelastic X-ray scattering at high-repetition-rate self-seeded X-ray free-electron lasers

Chubar, O.; Geloni, G.; Kocharyan, V.; Madsen, A.; Saldin, E.; Serkez, S.; Shvyd'ko, Y.; Sutter, J.

doi:10.1107/S1600577515024844

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Figure 1
Time–length (t–λ) 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. (2014

) 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 ∊ = E_f-E_i 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 OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 23| Part 2| March 2016| Pages 410-424

doi:10.1107/S1600577515024844

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