Dissociative Recombination and Excitation of CH5+: Absolute Cross Sections and Branching Fractions
Dissociative Recombination and Excitation of CH5+: Absolute Cross Sections and Branching Fractions
复制标题
CH5 的解离重组和激发：绝对横截面和分支分数
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
S. Datz
中科院分区：
文献类型：
--
作者：
J. Semaniak;A. Larson;A. Le Padellec;C. Strömholm;M. Larsson;S. Rosén;R. Peverall;H. Danared;N. Djurić;G. Dunn;S. Datz
使用重离子存储环CRYRING测量碰撞能量低于50 eV的绝对解离复合和解离激发截面。推导出的热速率系数与以前的光束数据是一致的，但比通过流动的余辉朗缪尔探针技术测得的速率低3倍。在9 eV处发现了解离复合截面的共振结构。我们已经确定的分支分数在DR的CH+5低于0.2 eV。分支由三体CH 3 + H + H和CH 2 + H2 + H解离通道主导，其分支比分别为0.7和0.2;因此甲烷是解离产物中的次要物质。无论是测量的绝对截面和分支的CH+5的解离复合可以有重要的影响模型的稠密星际云和丰富的CH 2，CH 3和CH 4在这些介质中。
The heavy-ion storage ring CRYRING was used to measure the absolute dissociative recombination and dissociative excitation cross sections for collision energies below 50 eV. Deduced thermal rates coefficients are consistent with previous beams data but are lower by a factor of 3 than the rates measured by means of the flowing afterglow Langmuir probe technique. A resonant structure in dissociative recombination cross section was found at 9 eV. We have determined the branching fractions in DR of CH+5 below 0.2 eV. The branching is dominated by three-body CH3 + H + H and CH2 + H2 + H dissociation channels, which occur with branching ratios of ≈ 0.7 and ≈ 0.2, respectively; thus methane is a minor species among dissociation products. Both the measured absolute cross sections and branching in dissociative recombination of CH+5 can have important implications for the models of dense interstellar clouds and abundance of CH2, CH3 and CH4 in these media.