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Improvement in XAFS beamline BL01B1 at SPring-8

T Uruga1, H Tanida, K Kato, Y Furukawa, T Kudo and N Azumi

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Beamline BL01B1 was constructed for conventional XAFS measurements using a bending magnet light source at SPring-8 in 1997 [1]. BL01B1 covers a wide energy range from 3.8 to 113 keV using an adjustable inclined double-crystal monochromator and a double mirror system. Here, we describe a newly developed apparatus and the current status of the BL01B1. A time-efficient QEXAFS method was developed to measure high quality spectra up to high-k regions in the shortest possible time. The method involves sweeping the monochromator continuously at a variable angular speed depending on the k-region using a VME stepping motor controller. During scanning, a pair of crystals of the monochromator rotates without translation motion like a channel-cut crystal. This QEXAFS method was applied to the fluorescence mode using a 19-element Ge detector combined with a digital X-ray processor system. A new conversion electron yield detector having a rotational sample stage was developed for single crystalline samples. Angular oscillations of 4 degrees in the sample rotation stage around the axis normal to the sample surface successfully remove diffraction noise in the XAFS spectra.


PACS

78.70.Dm X-ray absorption spectra

07.85.Nc X-ray and gamma-ray spectrometers

41.50.+h X-ray beam source magnets and x-ray optics for control of particle beams

61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.

41.85.Lc Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles

Subjects

Accelerators, beams and electromagnetism

Condensed matter: electrical, magnetic and optical

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 1 (2009)



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