電子遷移誘起脱離研究の先駆者, 石川義興博士および太田芳雄博士の業績紹介 Pioneers of Study on Desorption Induced by Electronic Transitions ; Achievements by Dr. Yoshioki Ishikawa and Dr. Yoshio Ohta

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著者

    • 南部 英 NAMBU Akira
    • ブルックヘブン国立研究所化学部門 Chemistry Department, Brookhaven National Laboratory

抄録

  Dr. Yoshioki Ishikawa is a pioneer who carried out systematic electron stimulated desorption (ESD) investigations for hydrogen adsorbed on a clean platinum plate (H<sub>2</sub>/Pt) under ultrahigh vacuum (UHV) conditions in 1942. (His name is spelled as Yosioki Isikawa in the original papers.) Although his papers are referred in several papers on desorption induced by electronic transitions (DIET), these seem to be not as well-known as famous ones by Menzel, Gomer, and Redhead in 1964. We describe his pioneering work in this article. He developed an UHV apparatus made of glass with a Pt plate and an oxide cathode pumped by a small mercury pump via a liquid air trap. Clear ESD signals were observed for H<sub>2</sub>/Pt at excitation energies of 8, 12, 14, 33-46, and 46-51 eV. He assigned the desorbate to atomic hydrogen (H), because it was pumped by a glass wall baked above 350°C. Based on these results and the potential curves of H<sub>2</sub> in the gas phase, he proposed a model for the ESD of H from H<sub>2</sub>/Pt; that is, the first step is an electronic transition of adsorbed H<sub>2</sub>, and the second is the desorption of H along the repulsive potential surface of the excited state. This was the first introduction of the notion of DIET. He also carried out an ESD study of H<sub>2</sub>O/Pt in 1943. We also introduce achievements by Dr. Yoshio Ohta, who was another pioneer in the field of DIET. He measured electron-stimulated ion desorption from an oxidized Ni plate. He found that the threshold excitation energy for ion desorption is 22 eV, and that the kinetic energy of the desorbed ion is 1∼2 eV. To explain these results, he also proposed the concept of DIET.<br>

収録刊行物

  • 真空  

    真空 49(10), 610-617, 2006-10-20 

    The Vacuum Society of Japan

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各種コード

  • NII論文ID(NAID)
    10018341312
  • NII書誌ID(NCID)
    AN00119871
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    05598516
  • NDL 記事登録ID
    8564225
  • NDL 雑誌分類
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL 請求記号
    Z16-474
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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