Novel angular encoder for a quick-extended x-ray absorption fine structure monochromator

Journal Article · Fri Aug 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2966393· OSTI ID:21124107

Stoetzel, J; Luetzenkirchen-Hecht, D; Frahm, R ^[1]; Fonda, E; De Oliveira, N; Briois, V ^[2]

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1. Fachbereich C, Physik Bergische Universitaet Wuppertal, Gaussstr. 20, 42097 Wuppertal (Germany)
2. Synchrotron SOLEIL L'Orme des Merisiers, Saint Aubin, 91192 Gif sur Yvette (France)

New concepts for time-resolved x-ray absorption spectroscopy using the quick-extended x-ray absorption fine structure (QEXAFS) method are presented. QEXAFS is a powerful tool to gain structural information about, e.g., fast chemical reactions or phase transitions on a subsecond scale. This can be achieved with a monochromator design that employs a channel-cut crystal on a cam driven tilt table for rapid angular oscillations of the Bragg angle. A new angular encoder system and a new data acquisition were described and characterized that were applied to a QEXAFS monochromator to get spectra with a directly measured accurate energy scale. New electronics were designed to allow a fast acquisition of the Bragg angle values and the absorption data during the measurements simultaneously.

• OSTI ID: 21124107
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 8; Other Information: DOI: 10.1063/1.2966393; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
ABSORPTION SPECTROSCOPY
BRAGG REFLECTION
CHEMICAL REACTIONS
COMPUTER-AIDED MANUFACTURING
CRYSTALS
DATA ACQUISITION
DESIGN
FINE STRUCTURE
INFORMATION
MONOCHROMATORS
PHASE TRANSFORMATIONS
TIME RESOLUTION
X RADIATION
X-RAY SPECTROSCOPY