Spectrometer for high resolution resonant inelastic x-ray scatteringa)

Schülke, W.; Kaprolat, A.; Fischer, Tony; Höppner, K.; Wohlert, F.

doi:10.1063/1.1145642

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…Several synchrotrons offer hard x-ray beamlines equipped with high-resolution emission spectrometers. [6][7][8][9][10][11][12][13][14][15][16][17] The spectrometer presented here is installed at the Su-perXAS beamline of the Swiss Light Source. The SuperXAS beamline is equipped with a collimating mirror, followed by a fixed-exit double crystal monochromator to ensure high energy resolution.…”

Section: Introductionmentioning

confidence: 99%

Five-element Johann-type x-ray emission spectrometer with a single-photon-counting pixel detector

Kleymenov

Bokhoven

Dávid

et al. 2011

Review of Scientific Instruments

101

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A Johann-type spectrometer with five spherically bent crystals and a pixel detector was constructed for a range of hard x-ray photon-in photon-out synchrotron techniques, covering a Bragg-angle range of 60°-88°. The spectrometer provides a sub emission line width energy resolution from sub-eV to a few eV and precise energy calibration, better than 1.5 eV for the full range of Bragg angles. The use of a pixel detector allows fast and easy optimization of the signal-to-background ratio. A concentration detection limit below 0.4 wt% was reached at the Cu Kα(1) line. The spectrometer is designed as a modular mobile device for easy integration in a multi-purpose hard x-ray synchrotron beamline, such as the SuperXAS beamline at the Swiss Light Source.

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Section: Introductionmentioning

confidence: 99%

Five-element Johann-type x-ray emission spectrometer with a single-photon-counting pixel detector

Kleymenov

Bokhoven

Dávid

et al. 2011

Review of Scientific Instruments

101

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“…In particular, it allows Cu + and Cu 2+ to be distinguished unambiguously. 23,24 With recent instrumentation development, 22,[25][26][27][28][29][30][31][32][33][34][35][36] few synchrotrons made the HERFD XAS technique available to the XAS community. Applications of HERFD XAS to catalysis include the study of Fe/ZSM-5 by Heijboer et al, 37 Mn/ZSM-5 by Radu et al, 38 Au/Al 2 O 3 by van Bokhoven et al, 39 and Pt/Al 2 O 3 by Singh et al 40 The aim of the experiment reported is to evaluate the state of the Cu/ZnO/Al 2 O 3 catalyst under reaction conditions, which is achieved with operando HERFD XAS at realistic temperature, pressure, and reaction gas mixture composition.…”

Section: Introductionmentioning

confidence: 99%

Structure of the methanol synthesis catalyst determined by in situHERFD XAS and EXAFS

Kleymenov

Sá

Abu‐Dahrieh

et al. 2012

Catal. Sci. Technol.

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A Cu/ZnO/Al 2 O 3 commercial catalyst for methanol synthesis from syngas was investigated under operational conditions. HERFD XAS and EXAFS data were recorded under different reaction gas mixtures, temperatures, and pressures. Activation of the catalyst precursor occurred via a Cu + intermediate. The active catalyst predominantly consists of metallic Cu and ZnO. Methanol production only starts when all accessible Cu is reduced. The structure of the active catalyst did not change with temperature or pressure even though the methanol yield changed strongly. Formation of a carbon-containing layer on top of the catalyst surface was detected by TPD, which was correlated with a several-hour induction period in the methanol production after the catalyst reduction.

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“…The fluorescence light emitted during the decay process can be recorded using a secondary crystal analyzer with an energy bandwidth similar to that of the primary monochromator of the synchrotron beamline. [37][38][39] The process can be viewed as an inelastic scattering of the incident photon at the Mn atom and is theoretically described by the Kramers-Heisenberg formula: 40,41 This description is analogous to optical resonance Raman spectroscopy. 42,43 The intermediate state |n〉 is reached from the ground state |g〉 via a transition operator T 1 .…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structure of Mn in Oxides, Coordination Complexes, and the Oxygen-Evolving Complex of Photosystem II Studied by Resonant Inelastic X-ray Scattering

et al. 2004

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Resonant inelastic X-ray scattering (RIXS) was used to collect Mn K pre-edge spectra and to study the electronic structure in oxides, molecular coordination complexes, as well as the S1 and S2 states of the oxygen-evolving complex (OEC) of photosystem II (PS II). The RIXS data yield two-dimensional plots that can be interpreted along the incident (absorption) energy or the energy transfer axis. The second energy dimension separates the pre-edge (predominantly 1s to 3d transitions) from the main K-edge, and a detailed analysis is thus possible. The 1s2p RIXS final-state electron configuration along the energy transfer axis is identical to conventional L-edge absorption spectroscopy, and the RIXS spectra are therefore sensitive to the Mn spin state. This new technique thus yields information on the electronic structure that is not accessible in conventional K-edge absorption spectroscopy. The line splittings can be understood within a ligand field multiplet model, i.e., (3d,3d) and (2p,3d) two-electron interactions are crucial to describe the spectral shapes in all systems. We propose to explain the shift of the K pre-edge absorption energy upon Mn oxidation in terms of the effective number of 3d electrons (fractional 3d orbital population). The spectral changes in the Mn 1s2p(3/2) RIXS spectra between the PS II S1 and S2 states are small compared to that of the oxides and two of the coordination complexes (Mn(III)(acac)3 and Mn(IV)(sal)2(bipy)). We conclude that the electron in the step from S1 to S2 is transferred from a strongly delocalized orbital.

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Spectrometer for high resolution resonant inelastic x-ray scatteringa)

Cited by 12 publications

References 7 publications

Five-element Johann-type x-ray emission spectrometer with a single-photon-counting pixel detector

Five-element Johann-type x-ray emission spectrometer with a single-photon-counting pixel detector

Structure of the methanol synthesis catalyst determined by in situHERFD XAS and EXAFS

The Electronic Structure of Mn in Oxides, Coordination Complexes, and the Oxygen-Evolving Complex of Photosystem II Studied by Resonant Inelastic X-ray Scattering

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