Temperature dependence of thermal positive ion production through dissociation of polyatomic molecules.

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概要

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• The production of a thermal positive ion (M<SUP>+</SUP>) from a polyatomic molecule (MX) incident upon a heated metal surface is investigated theoretically as a function of surface temperature (<I>T</I>). The quantitative expression of the ion emission current (<I>i</I><SUP>+</SUP>) of M<SUP>+</SUP> at a constant incident flux (<I>N</I>) of MX is found to change according to the condition whether the work function (φ) of the surface is higher or lower than the first ionization energy (<I>I</I>) of M and also to the degree of dissociation (γ) of MX on the surface. Namely,<BR>(<U>Remark: Graphics omitted.</U>)<BR>Here <I>D</I> is the bond dissociation energy of MX and <I>K</I>′s are virtually independent of <I>T</I>. In any other cases <I>i</I><SUP>+</SUP> cannot be expressed in such a simple form. The particular temperature regions corresponding to γ≈1 or γ<<1 are evaluated for given sets of <I>N</I>, <I>D</I>, <I>I</I>, and φ.

• 公益社団法人 日本化学会の論文

著者

• Suga Masao

  Department of Chemistry, Faculty of Science, Ehime University

• Hidaka Yoshiaki

  Department Of Chemistry Faculty Of Science Ehime University

• Kawano Hiroyuki

  Department Of Applied Chemistry Faculty Of Engineering Oita University

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