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大学・研究所にある論文を検索できる 「Dissociative Excitation of C_2H_2 by Collisions with Metastable Ne(3^P_0,2) Atoms in a Flowing Afterglow」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Dissociative Excitation of C_2H_2 by Collisions with Metastable Ne(3^P_0,2) Atoms in a Flowing Afterglow

TSUJI, Masaharu 辻, 正治 ツジ, マサハル KOMATSU, Takahiro 小松, 孝弘 コマツ, タカヒロ UTO, Keiko 宇都, 慶子 ウト, ケイコ HAYASHI, Jun-Ichiro 林, 潤一郎 ハヤシ, ジュンイチロウ TSUJI, Takeshi 辻, 剛志 ツジ, タケシ 九州大学 DOI:https://doi.org/10.15017/4479587

2021.09

概要

CH(A2Δ−X2Πr, B2Σ− −X2Πr, and C2Σ+−X2Πr) and C2(d3Πg−a3Πu, C1Πg−A1Πuk, e3Πg−a3Πu, and D1Σu+−X1Σg+) emission systems have been observed by dissociative excitation of C2H2 by collisions with metastable Ne(3P2:16.62 and 3P0:16.72 eV) atoms in the flowing afterglow. The emission rate constants of CH(A,B,C) and C2(d,C,e,D) were determined to be 1.72 and 10.2 × 10-13 cm3 molecule-1 s-1, respectively. The major product was C2(d), which occupied 78% of all emitting products. A comparison of the total emission rate constant, 1.19 × 10-12 cm3 molecule-1 s-1, with reported Penning ionization rate constant indicated that branching ratios of Penning ionization and dissociative excitation in the Ne(3P0,2)/C2H2 reaction are 99.3 and 0.7%, respectively. The nascent vibrational and rotational distributions of CH(A:𝑣'=0–2,B:𝑣'=0) and C2(d:𝑣'=0–6, C:𝑣'=0–3, e:𝑣'=0–6, D:𝑣'=0–2) were determined and compared with statistical prior ones. The rotational distributions of major CH(A:𝑣'=0– 2) and C2(d:𝑣'=0–6) states were expressed by single Boltzmann temperatures of 2500–4200 K and 1300–2850 K, respectively. The reaction dynamics could not be explained by simple statistical models. It was concluded that rotationally excited CH* and vibrationally and rotationally excited C2* are formed via trans-bent Rydberg (superexcited) C2H2** states with elongated C≡C bond and bending mode excitation.

Key words:
Dissociative excitation, Acetylene, Metastable Ne* atoms, Flowing afterglow, Energy transfer, Rovibrational distribution, Superexcited state, Trans-bent Rydberg state

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