New developments in fabrication of high-energy-resolution analyzers for inelastic X-ray spectroscopy

Said, Ayman; Sinn, H.; Divan, Ralu

doi:10.1107/s0909049511001828

Cited by 82 publications

(73 citation statements)

References 14 publications

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“…Thirdly, the tails of the combined CDFDW spectral resolution function is two orders of magnitude steeper than the tails of the Lorentzian distribution with the same FWHM. It should be noted that the long Lorentzian tails (spectral contrast C M = 11), are typical for spectral resolution functions of all existing inelastic x-ray scattering (IXS) spectrometers [24][25][26][27]. For the Lorentzian tails to reach the level of the measured CDFDW resolution function, the width of the Lorentzian distribution would have to be reduced to 65 µeV.…”

Section: Cdfdw Spectral Resolution Functionmentioning

confidence: 99%

Using angular dispersion and anomalous transmission to shape ultramonochromatic x rays

et al. 2011

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Optical spectrometers, instruments that work with monochromatic light, are commonly rated by the spectral bandwidth, which defines the ability to resolve closely spaced spectral components. The ability to detect faint objects among these components, spectral contrast, is another desired aspect.Here we demonstrate that a combined effect of angular dispersion (AD) and anomalous transmission (AT) of x rays in Bragg reflection from asymmetrically cut crystals can shape spectral distributions of x rays to profiles with record high contrast and small bandwidths.The AD&AT x-ray optics is implemented as a five-reflection three-crystal arrangement featuring a combination of the above mentioned attributes, so much desirable for x-ray monochromators and analyzers: a spectral contrast of 500, a bandwidth of 0.46 meV and a remarkably large angular acceptance of 107 µrad. The new optics can become a foundation for the next generation inelastic x-ray scattering spectrometers for studies of atomic dynamics.

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Section: Cdfdw Spectral Resolution Functionmentioning

confidence: 99%

Using angular dispersion and anomalous transmission to shape ultramonochromatic x rays

et al. 2011

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“…The experiments were conducted at beamline 30-ID-C (HERIX [34,35]) at the Advanced Photon Source (APS). The highly monochromatic x-ray beam of incident energy E i ≃ 23.7 keV (λ = 0.5226Å) had an energy resolution ∆E i ∼ 1.0 meV (full width at half maximum), and was focused on the sample with a beam cross-section ∼ 35 × 15 µm (horizontal×vertical).…”

Section: Inelastic X-ray Scatteringmentioning

confidence: 99%

Lattice dynamics and thermal transport in multiferroicCuCrO2

et al. 2017

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Inelastic neutron and x-ray scattering measurements of phonons and spin waves were performed in the delafossite compound CuCrO2 over a wide range of temperature, and complemented with first-principles lattice dynamics simulations. The phonon dispersions and density of states are well reproduced by our density functional calculations, and reveal a strong anisotropy of Cu vibrations, which exhibit low-frequency modes of large amplitude parallel to the basal plane of the layered delafossite structure. The low frequency in-plane modes also show a systematic temperature dependence of neutron and x-ray scattering intensities. In addition, we find that spin fluctuations persist above 300 K, far above the Néel temperature for long-range antiferromagnetic order, T N ≃ 24 K. Our modeling of the thermal conductivity, based on our phonon measurements and simulations, reveals a significant anisotropy and indicates that spin fluctuations above T N constitute an important source of phonon scattering, considerably suppressing the thermal conductivity compared to that of the isostructural but non-magnetic compound CuAlO2.

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“…Data analysis was performed using the DAVE software suite 35 . Inelastic x-ray scattering measurements on a single crystal with lateral dimensions 0.3 mm and thickness 0.015 mm were carried out on the HERIX spectrometer 36,37 at Sector 30 of the Advanced Photon Source using 23.7 keV incident energy photons, with an energy resolution of 1.5 meV. The sample was taken from a large single crystal that exhibits a small outof-plane moment of 0.011 µ B /U 17 .…”

Section: A Experimentsmentioning

confidence: 99%