An inelastic X-ray spectrometer with 2.2meV energy resolution

Sinn, H.; Alp, E.E.; Alataş, Ahmet; Barraza, Juan; Bortel, Gábor; Burkel, E.; Shu, Deming; Sturhahn, W.; Sutter, John P.; Toellner, T. S.; Zhao, Jiyong

doi:10.1016/s0168-9002(01)00755-0

Cited by 73 publications

(52 citation statements)

References 7 publications

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“…The orthorhombic notation and the F mmm symmetry are used throughout this report. The measurements were made using the HERIX instrument on beamline 3-ID of the Advanced Photon Source at Argonne National Laboratory 40,41 . The HERIX instrument is on an insertion device beamline with a six-bounce monochromator setup providing an incident energy of 21.657 keV, and a resolution of 2.3 meV at the elastic line.…”

Section: Methodsmentioning

confidence: 99%

Phonon softening near the structural transition in BaFe2As2observed by inelastic x-ray scattering

et al. 2011

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In this work we present the results of an inelastic x-ray scattering experiment detailing the behavior of the transverse acoustic [110] phonon in BaFe2As2 as a function of temperature. When cooling through the structural transition temperature, the transverse acoustic phonon energy is reduced from the value at room temperature, reaching a maximum shift near inelastic momentum transfer q = 0.1. This softening of the lattice results in a change of the symmetry from tetragonal to orthorhombic at the same temperature as the transition to long-range antiferromagnetic order. While the lattice distortion is minor, the anisotropy in the magnetic exchange constants in pnictide parent compounds is large. We suggest mechanisms of electron-phonon coupling to describe the interaction between the lattice softening and onset of magnetic ordering.

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Section: Methodsmentioning

confidence: 99%

Phonon softening near the structural transition in BaFe2As2observed by inelastic x-ray scattering

et al. 2011

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“…Here, we avoid this constraint by using high-resolution IXS with the HERIX instrument at the Advanced Photon Source at Argonne National Laboratory [13][14][15]; this IXS technique has proven effective for measuring phonon dispersions in actinides [16,17] and the phonon density of states (DOS) of plutonium [18]. To obtain an accurate representation of the phonon DOS from IXS on a powder sample, it is necessary to measure over a large range of momentum transfers (Q) so as to cover several Brillouin zones.…”

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confidence: 99%

Measurement of the phonon density of states of PuO2(+2%Ga): A critical test of theory

et al. 2012

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“…A spectrometer used for IXS studies is working at a photon energy of 21.7 keV. 5 At this energy, the vertical emittance of the undulator is about 12.4 rad, while the acceptance of the diamond ͑111͒ is 8.0 rad. The main purpose of the collimator is to collimate the x rays around 21-25 keV, which covers the working energy for the IXS spectrometer and the nuclear resonance energies of 151 Eu ͑21.5 keV͒, 119 Sn ͑23.9 keV͒, and 161 Dy ͑25.6 keV͒.…”

Section: Design Of a White Beam Collimatormentioning

confidence: 99%