The cross-section and branching fractions for dissociative recombination of the diacetylene cation C<sub>4sub>D<sub>2sub><sup>+sup>

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• 作者：M. Danielsson ; M. Hamberg ; V. Zhaunerchyk ; A. Ehlerding ; M. Kamiń ; ska ; F. Hellberg ; R.D. Thomas ; F. &#xd6 ; sterdahl ; M. af Ugglas ; A. K&#xe4 ; llberg ; A. Simonsson ; A. Pa&#xe1 ; 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
• 期刊代码：43_13873806
• 类别：ch
• 出版时间：15 June 2008
• 卷：273
• 期：3
• 页码：111-116
• 文件大小：311 K

摘要

In this paper we report the results of a study on the dissociative recombination (DR) of the diacetylene cation, C<sub>4sub>D<sub>2sub><sup>+sup>, 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 src="http://www.sciencedirect.com/scidirimg/entities/223c.gif" alt="not, vert, similar" title="not, vert, similar" border="0">0 eV collision energy were measured. The DR cross-section was best fitted using the expression σ(E) = (7.5 ± 1.5) &#xd7; 10<sup>−16sup> &#xd7; E<sup>−(1.29±0.03)sup> cm<sup>2sup> over the collision energy range 1–100 meV. The thermal rate coefficient was deduced from the cross-section to be src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">(T) = (1.10 ± 0.15) &#xd7; 10<sup>−6sup> &#xd7; (T/300)<sup>−(0.79±0.03)sup> cm<sup>3sup>/s. The reported branching fractions for C<sub>4sub>D<sub>2sub><sup>+sup> agree with previous experiments on the DR of C<sub>4sub>H<sub>2sub><sup>+sup> performed at the ASTRID storage ring in Aarhus, Denmark, and furthermore, indicate that the DR of C<sub>4sub>D<sub>2sub><sup>+sup> possesses only two channels leading to the following products: C<sub>4sub>D + D (75%) and C<sub>2sub>D + C<sub>2sub>D (25%).