The cross-section and branching fractions for dissociative recombination of the diacetylene cation C₄D₂⁺

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• 作者：M. Danielsson ; M. Hamberg ; V. Zhaunerchyk ; A. Ehlerding ; M. Kamiń ; ska ; F. Hellberg ; R.D. Thomas ; F. Ö ; sterdahl ; M. af Ugglas ; A. Kä ; llberg ; A. Simonsson ; A. Paá ; l ; M. Larsson ; W.D. Ge
• 关键词：Diacetylene cation ; Dissociative recombination ; Branching fraction ; Cross-section
• 刊名：International Journal of Mass Spectrometry
• 出版年：2008
• 出版时间：15 June 2008
• 年：2008
• 卷：273
• 期：3
• 页码：111-116
• 全文大小：311 K

文摘

In this paper we report the results of a study on the dissociative recombination (DR) of the diacetylene cation, C₄D₂⁺, which has been carried out at the ion storage ring CRYRING in Stockholm, Sweden. The energy-dependent absolute DR cross-section as well as the branching fractions at 0 eV collision energy were measured. The DR cross-section was best fitted using the expression σ(E) = (7.5 ± 1.5) × 10⁻¹⁶ × E^{−(1.29±0.03)} cm² over the collision energy range 1–100 meV. The thermal rate coefficient was deduced from the cross-section to be (T) = (1.10 ± 0.15) × 10⁻⁶ × (T/300)^{−(0.79±0.03)} cm³/s. The reported branching fractions for C₄D₂⁺ agree with previous experiments on the DR of C₄H₂⁺ performed at the ASTRID storage ring in Aarhus, Denmark, and furthermore, indicate that the DR of C₄D₂⁺ possesses only two channels leading to the following products: C₄D + D (75 % ) and C₂D + C₂D (25 % ).