Gas Phase Study of C+ Reactions of Interstellar Relevance

Gas Phase Study of C+ Reactions of Interstellar Relevance
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与星际相关的 C 反应的气相研究

DOI：
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发表时间：
2008
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通讯作者：
V. Bierbaum
V. Bierbaum
中科院分区：
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文献类型：
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作者：
Oscar Martinez, Jr.;Nicholas B. Betts;Stephanie M. Villano;Nicole Eyet;T. Snow;V. Bierbaum

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目前许多反应速率常数的不确定性导致难以提供令人满意的星际化学模型。在这里，我们使用流动余辉选择离子流管 (FASIFT) 技术，对 C+ 与 NH3、CH4、O2、H2O 和 C2H2 的气相反应的速率常数和产物支化比进行了新的测量。结果是使用两台分别校准和优化的仪器获得的；此外，使用低电离能确保基态C+的形成，验证中性反应物的纯度，并将质量歧视最小化。
The current uncertainty in many reaction rate constants causes difficulties in providing satisfactory models of interstellar chemistry. Here we present new measurements of the rate constants and product branching ratios for the gas phase reactions of C+ with NH3, CH4, O2, H2O, and C2H2, using the flowing afterglow-selected ion flow tube (FASIFT) technique. Results were obtained using two instruments that were separately calibrated and optimized; in addition, low ionization energies were used to ensure formation of ground-state C+, the purities of the neutral reactants were verified, and mass discrimination was minimized.