4.3 Article

In Situ Picosecond XAFS Study of an Excited State of Tungsten Oxide

Journal

CHEMISTRY LETTERS
Volume 43, Issue 7, Pages 977-979

Publisher

CHEMICAL SOC JAPAN
DOI: 10.1246/cl.140144

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Funding

  1. New Energy and Industrial Technology Development Organization (NEDO)
  2. Institute of Material Structure Science (KEK), Tsukuba, Japan under Program Advisory Committee [2013G166]
  3. Grants-in-Aid for Scientific Research [25106010, 13J04364, 25107527] Funding Source: KAKEN

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The electronic state modification and the decay process of WO3 after photoabsorption were followed using picosecond X-ray absorption fine structure (XAFS) spectroscopy. The W d(e(g)) orbital was filled by transition from the oxygen valence state. The decay process is explained mostly by a first-order process with a rate constant k = 0.5 +/- 0.1 ns(-1). The UV optical length is extremely important to follow the photoreduction process using XAFS spectroscopy.

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