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- W1676870385 abstract "The configuration and performance of the time‐resolved dispersive XAFS (DXAFS) instrument, which has been constructed at the NW2A beamline of PF‐AR (KEK), are presented. The DXAFS instrument is mainly composed of a polychromator part, a position control part for sample, and a linear detector part. The Bragg‐ and Laue‐type polychromator crystal (Si(111) or Si(311)) is bent using the holder with fixed bending radius, in which the thermostated water is circulated to prevent the temperature change of crystal due to the heat load. The photodiode array (PDA) with and without phosphor screen is used as the linear X‐ray detector, and the minimum exposure time is 2 ms for the 1024‐element PDA. The phosphor screen on the PDA detector prevents the damage of the chip especially for high energy X‐rays but the existence reduces the energy resolution because of the scattering of the visible light converted on the phosphor. The DXAFS instrument was applied to the mechanistic study of the reduction processes of Cu supported on MFI zeolite, and the intermediate Cu(I) states have been successfully observed during the reduction from Cu(II) to Cu(0)." @default.
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- W1676870385 date "2007-01-01" @default.
- W1676870385 modified "2023-10-17" @default.
- W1676870385 title "Time-Resolved Dispersive XAFS Instrument at NW2A Beamline of PF-AR" @default.
- W1676870385 doi "https://doi.org/10.1063/1.2436286" @default.
- W1676870385 hasPublicationYear "2007" @default.
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