In situ Measurements of the Desorption of Water from a TiO₂ Surface under Dry Air by Collecting the Photoemission Yield with an Open Counter

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  • YAMASHITA Daisuke
    Research and Development Department, Riken Keiki Co., Ltd.
  • ISHIZAKI Atsushi
    Research and Development Department, Riken Keiki Co., Ltd.
  • YAMAMOTO Tomoyuki
    Faculty of Science and Engineering, Waseda University Institute of Condensed-Matter Science, Waseda University

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  • <i>In situ</i> Measurements of the Desorption of Water from a TiO<sub>2</sub> Surface under Dry Air by Collecting the Photoemission Yield with an Open Counter

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We investigated the desorption of water from a TiO2 surface under a dry atmosphere by collecting the photoemission yield spectra with an open counter. For this purpose, a new attachment for the photoemission yield measurement was prepared. This apparatus is capable of detecting, in the open air, low-energy electrons excited by photons under dried atmospheres; the dew point is below −35°C. A significant change in the photoemission yield spectra due to exposure to a dry atmosphere was observed. To gain a better understanding of these results, observations of the change in the photoemission yield spectra caused by the thermal desorption of adsorbed water were also carried out. The results are consistent with those obtained by exposure to a dry atmosphere. Based on the relationship between the photoemission yield and the thickness of the water layer, the time dependence of the change in the thickness was explained by the second-order reaction rate equation.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 30 (5), 575-579, 2014

    社団法人 日本分析化学会

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