&lt;title&gt;Graded crystal monochromator at Bessy II&lt;/title&gt;

Erko, A.; Packe, Ingo; Gudat, W.; Abrosimov, Nikolai V.; Firsov, Alexander A.

doi:10.1117/12.411628

Cited by 17 publications

(18 citation statements)

References 1 publication

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“…Synchrotron X-ray diffraction. Temperature-dependent synchrotron X-ray diffraction data were collected at KMC-2 beamline 31,32 at the synchrotron source BESSY II (HZB, Berlin, Germany). The data were collected at a photon energy of 8048 eV, corresponding to Cu Ka 1 radiation.…”

Section: Crystallographic Characterisationmentioning

confidence: 99%

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

et al. 2019

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Section: Crystallographic Characterisationmentioning

confidence: 99%

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

et al. 2019

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“…Such devices were operated in the integrating mode; that is, a decrease in the photocurrent is measured when the detector is set in the diffraction condition. This effect has been used, for example, for angular control of synchrotron monochromators (Jach, 1990) and in determining the energy resolution of graded SiGe monochromators (Erko et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

A new method to detect an X-ray diffracted beam at an angle of 90°

Hönnicke¹,

Kakuno²,

Cusatis³

et al. 2004

J Appl Cryst

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A standard procedure cannot be used to detect a back-diffracted X-ray beam (h-beam) at a diffraction angle of 90 (back-diffraction) because the detector will intercept the incident beam. A new method is proposed in which a silicon single crystal simultaneously back-diffracts and detects the variation of the photon counting rate when the crystal is in and out of the X-ray back-diffraction condition. The detected intensity shows the inverted diffraction pro®le; that is, a dip in the photon counting rate due to the photons that are being backdiffracted. The experimental results presented here show such a dip, referred to here as the anti-h peak or the inverted rocking curve (IRC), for different situations.

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“…(BESSY II, Berlin, Germany). [88] The XANES and EXAFS spectra were recorded at the Co K edge; energy calibration was performed with cobalt metal foil. Measurements were performed in transmission mode by using ionisation chambers, additionally the fluorescence was recorded by using a fluorescence yield detector (Si-PIN photodiode).…”

mentioning

confidence: 99%

Pyrazolate‐Based Cobalt(II)‐Containing Metal–Organic Frameworks in Heterogeneous Catalytic Oxidation Reactions: Elucidating the Role of Entatic States for Biomimetic Oxidation Processes

Tonigold

Mavrandonakis

et al. 2011

Chemistry A European J

141

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Crystal structures of two metal-organic frameworks (MFU-1 and MFU-2) are presented, both of which contain redox-active Co(II) centres coordinated by linear 1,4-bis[(3,5-dimethyl)pyrazol-4-yl] ligands. In contrast to many MOFs reported previously, these compounds show excellent stability against hydrolytic decomposition. Catalytic turnover is achieved in oxidation reactions by employing tert-butyl hydroperoxide and the solid catalysts are easily recovered from the reaction mixture. Whereas heterogeneous catalysis is unambiguously demonstrated for MFU-1, MFU-2 shows catalytic activity due to slow metal leaching, emphasising the need for a deeper understanding of structure-reactivity relationships in the future design of redox-active metal-organic frameworks. Mechanistic details for oxidation reactions employing tert-butyl hydroperoxide are studied by UV/Vis and IR spectroscopy and XRPD measurements. The catalytic process accompanying changes of redox states and structural changes were investigated by means of cobalt K-edge X-ray absorption spectroscopy. To probe the putative binding modes of molecular oxygen, the isosteric heats of adsorption of O(2) were determined and compared with models from DFT calculations. The stabilities of the frameworks in an oxygen atmosphere as a reactive gas were examined by temperature-programmed oxidation (TPO). Solution impregnation of MFU-1 with a co-catalyst (N-hydroxyphthalimide) led to NHPI@MFU-1, which oxidised a range of organic substrates under ambient conditions by employing molecular oxygen from air. The catalytic reaction involved a biomimetic reaction cascade based on free radicals. The concept of an entatic state of the cobalt centres is proposed and its relevance for sustained catalytic activity is briefly discussed.

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<title>Graded crystal monochromator at Bessy II</title>

Cited by 17 publications

References 1 publication

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

A new method to detect an X-ray diffracted beam at an angle of 90°

Pyrazolate‐Based Cobalt(II)‐Containing Metal–Organic Frameworks in Heterogeneous Catalytic Oxidation Reactions: Elucidating the Role of Entatic States for Biomimetic Oxidation Processes

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