Recent Advances and New Applications of TimeResolved Xray Absorption Spectroscopy

Frahm, R.; Richwin, M.; LtzenkirchenHecht, D.

doi:10.1238/physica.topical.115a00974

Cited by 52 publications

(22 citation statements)

References 2 publications

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“…The crystal was mounted on the oscillating tilt table inside the QEXAFS monochromator working with excenter mechanics. 50 A crystal oscillation frequency of 1 Hz yielded continuously two spectra each second collected at the Pd K edge, one with increasing energy, followed by the decreasing scan to the start energy. The fixed excenter disk installed in the QEXAFS mechanics yielded an energy range from 24.19 to 26.02 keV for each spectrum.…”

Section: Experimental Methodsmentioning

confidence: 99%

Oscillatory Behavior during the Catalytic Partial Oxidation of Methane: Following Dynamic Structural Changes of Palladium Using the QEXAFS Technique

Stötzel

Frahm

Kimmerle³

et al. 2011

J. Phys. Chem. C

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Section: Experimental Methodsmentioning

confidence: 99%

Oscillatory Behavior during the Catalytic Partial Oxidation of Methane: Following Dynamic Structural Changes of Palladium Using the QEXAFS Technique

Stötzel

Frahm

Kimmerle³

et al. 2011

J. Phys. Chem. C

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“…An angular encoder records the oscillations with a resolution of 0.03 arcsec synchronized to the signals of the ionization chambers which are used to record the absorption spectra. These components are described in detail in previous publications (Stö tzel et al, 2008(Stö tzel et al, , 2010bFrahm et al, 2005).…”

Section: Hardware Componentsmentioning

confidence: 99%

A new stand-alone QEXAFS data acquisition system forin situstudies

Stötzel

Lützenkirchen‐Hecht

Frahm

2011

J Synchrotron Radiat

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To meet the demands of the QEXAFS (quick-scanning extended X-ray absorption fine structure) technique for a fast, user-friendly and flexible data acquisition a new stand-alone system with new software exploiting a multi-functional USB board was designed. The chosen approach allows the scanning of several analogue and digital data sources with up to 500000 samples each second over hours storable in binary or ASCII format without any dead-time. At the same time it is possible to visualize the acquired data instantaneously which provides a maximum of interactivity during the running experiment and also optimal conditions to select the best suited beamline and detector settings prior to each measurement. Furthermore, the QEXAFS monochromator and typically three current amplifiers are entirely controlled by the new software so that all monochromator settings can be synchronized with the data acquisition enabling programmed scans with alternating parameter sets. This versatile concept also enables the user to react immediately to changes in the sample during in situ studies. An interface to a three-axis stepper motor control unit is additionally included to control a sample stage which can again be synchronized with the data acquisition. Thus, spatially resolved scans and the usage of scan tools for sample alignment are feasible with the new system. Typical examples to demonstrate the features of the new data acquisition system are presented, the designed graphical user interface is described in detail and, furthermore, the crucial design parameters of a typical QEXAFS set-up are discussed.

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“…The SOLEIL Quick-EXAFS monochromator is an up-graded version of the monochromator recently developed by the Frahm's group [8] which deals with a channel cut crystal mounted on a cam driven tilt table that oscillates around a selected central Bragg angle, , with a user selectable angular amplitude, (t) ranging from 0.1 to 1.5 • . The angular amplitude is defined by a mechanical eccentric disk directly mounted inside the monochromator.…”

Section: Quick-exafs Monochromatormentioning

confidence: 99%

SAMBA: The 4–40 keV X-ray absorption spectroscopy beamline at SOLEIL

Briois

Fonda

Belin

et al. 2011

UVX 2010 - 10e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Abstract. The SAMBA X-ray Absorption beamline has been operating for users since January 2008. The beamline covers a large energy range from 4 up to 40 keV in two working modes: a "high flux" mode using a sagittally focusing monochromator and a "time-resolved" mode using a dedicated Quick-EXAFS monochromator. Herein a technical description of the main beamline components is given and results concerning energy resolution, available flux and time resolved performances are presented.

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Recent Advances and New Applications of TimeResolved Xray Absorption Spectroscopy

Cited by 52 publications

References 2 publications

Oscillatory Behavior during the Catalytic Partial Oxidation of Methane: Following Dynamic Structural Changes of Palladium Using the QEXAFS Technique

Oscillatory Behavior during the Catalytic Partial Oxidation of Methane: Following Dynamic Structural Changes of Palladium Using the QEXAFS Technique

A new stand-alone QEXAFS data acquisition system forin situstudies

SAMBA: The 4–40 keV X-ray absorption spectroscopy beamline at SOLEIL

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