Abstract
A time‐resolved quick x‐ray absorption fine structure (QXAFS) system was designed and constructed using high flux but low power quasimonochromatic undulator radiation at a helical undulator beamline, BL40XU at SPring‐8. At 12 keV, a flux of 1013 – 1014 photons/sec/0.1 % bw. was generated over an energy range of 1 keV with a total power of 7 – 15 W. A compact Si(111) channel cut monochromator having no active cooling was utilized. The monochromator was mounted on a galvano‐scanner stage within an experimental hutch. The stage could be oscillated at frequencies up to 100 Hz over a 1.4‐degree range. The Pt L3‐edge(11.6 keV) EXAFS spectra of Pt foil was measured in transmission and fluorescence modes up to k = 15 A−1 in a period of 50 ms/scan. In this report, the design of the QXAFS system and some preliminary experimental results are presented.
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