The dissociative excitation and dissociative ionization of simple aliphatic hydrocarbons by controlled electron impact.

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概要

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• Photoemissions from the following excited species were observed from simple aliphatic hydrocarbons (CH<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>4</SUB>, 1,3-C<SUB>4</SUB>H<SUB>6</SUB>) under controlled electron-impact excitation (0–400 eV) at wavelengths from 300 to 600 nm: H(Balmer), CH(A–X, B–X, C–X), CH<SUP>+</SUP>(A–X, B–A, b–a), C<SUB>2</SUB>(C–A, d–a; not from CH<SUB>4</SUB>), and C<SUB>4</SUB>H<SUB>2</SUB><SUP>+</SUP>(A–X; not from CH<SUB>4</SUB>). All the excited species except for C<SUB>4</SUB>H<SUB>2</SUB><SUP>+</SUP> from C<SUB>2</SUB>H<SUB>2</SUB> and C<SUB>2</SUB>H<SUB>4</SUB> were confirmed to be primarily produced. The excitation function (0–400 eV) and the appearance potential of H, CH, and CH<SUP>+</SUP> produced from CH<SUB>4</SUB> and C<SUB>2</SUB>H<SUB>2</SUB> were measured, and the corresponding processes of the fragmentation near the threshold were determined. The CH<SUB>4</SUB>+e→CH<SUP>+</SUP>(B)+H<SUB>2</SUB>(X)+H(<I>n</I>=1) and C<SUB>2</SUB>H<SUB>2</SUB>+e→CH<SUP>+</SUP>(B)+CH(X) processes were concluded to be responsible for the formation of CH<SUP>+</SUP>(B). The formation of ionic species, H<SUP>+</SUP> and CH<SUP>+</SUP>, can be considered as the limiting case of the dissociative excitation for producing H and CH. A triplet excitation process may contribute to the formation of CH(A) from C<SUB>2</SUB>H<SUB>2</SUB>. The observed threshold energies indicated that superexcited states were involved in the formation of excited neutral fragment species.

• 公益社団法人 日本化学会の論文

著者

• Tsuji Masaharu

  Faculty Of Bioresources Mie University

• Nishimura Yukio

  Faculty Of Engineering Keio University

• Ishibashi Nobuhiko

  Faculty Of Engineering Kyushu University

• Ogawa Teiichiro

  Faculty of Engineering, Kyushu University

• Nishimura Yukio

  Faculty of Engineering, Kyushu University

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• The dissociative excitation and dissociative ionization of simple aliphatic hydrocarbons by controlled electron impact.

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