An in-situ cell using "lab-on-a-chip" technologies has been designed and tested for characterization of catalysts and environmental materials using soft X-ray absorption spectroscopy and spectromicroscopy at photon energies above 250 eV. The sample compartment is 1.0 mm in diameter with a gas path length of 0.8 mm to minimize X-ray absorption in the gas phase. The sample compartment can be heated to 533 K by an Al resistive heater and gas flows up to 5.0 cm 3 min -1 can be supplied to the sample compartment through microchannels. The performance of the cell was tested by acquiring Cu L 3 -edge XANES data during the reduction and oxidation of a silica- show that with increasing temperature the Cu(II) peak intensity decreases as the Cu(I) peak intensity increases.
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