开发一种用于测量有效辐射结合速率系数的 glow- discharge 离子陷阱仪器
Development of a glow-discharge ion-trap instrument for measuring effective radiative-association rate coefficients
AI总结：
本文介绍了一种新型 glow- discharge 离子陷阱仪器，用于测量离子与中性分子反应的辐射结合速率系数，首次对 Ag+ + O2 反应进行了压力依赖性研究，并提取了有效速率系数的下限。
摘要：
直接测量离子与中性分子反应的辐射结合速率系数长期以来一直挑战着化学物理实验室，然而辐射结合是冷稀薄空间中最重要的过程之一。为此开发了一种反应动力学仪器，旨在测量与天体物理对象相关的慢速有效反应速率系数。该仪器包括 glow- discharge 离子源、四极质谱滤波器和四极离子陷阱，后者可长时间捕获反应物和产物以测量慢速动力学。通过多种配置评估了 glow- discharge 离子源的性能和适应性。在室温下，通过离子陷阱在伪一级条件下研究了 Ag+ 与 O2 的反应，首次对该反应进行了压力依赖性研究，并提取了 Ag+ + O2 有效辐射结合速率系数的下限为 1 × 10^-15 cm^3 molecule^-1 s^-1。该仪器可测量多种原子和分子离子与中性分子在不同速率下的有效辐射结合速率系数。
英文摘要：
The ability to directly measure radiative-association rate coefficients for reactions between ions and neutral molecules has long challenged chemical physics laboratories, yet radiative association is one of the most important processes occurring in cold, diffuse regions of space. A reaction kinetics instrument has been developed for the investigation of ion--molecule radiative-association reactions, aimed at measuring slow, effective reaction rate coefficients for species relevant to astrophysical objects. The instrument consists of a glow-discharge ion source for production of bright and stable ion currents, a quadrupole mass filter for mass selection and detection, and a quadrupole ion trap capable of trapping reactants and products for the long times needed to measure slow kinetics. The performance and adaptability of the glow-discharge ion source has been evaluated using several configurations. To assess the feasibility of measuring reaction rate coefficients, the reaction of Ag$^{+}$ and O$_{2}$ was studied under pseudo-first-order conditions in the ion trap at room temperature. We present the first pressure-dependent study of this reaction and extract a lower limit of $1 \times 10^{-15}$ cm$^3$ molecule$^{-1}$ s$^{-1}$ for the Ag$^{+}$ + O$_{2}$ effective radiative-association rate coefficient. Measurements of effective radiative-association rate coefficients are possible for diverse atomic and molecular ions that react with neutral molecules over a range of rates in this versatile new instrument.
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