研究极低温气相碰撞过程动力学和分支比的新仪器
A new instrument for kinetics and branching ratio studies of gas phase collisional processes at very low temperatures
摘要：
介绍了一种用于低温气相中性-中性反应（包括团簇过程）动力学研究的新仪器。它结合了超音速流反应器与真空紫外（VUV）同步光电离飞行时间质谱。采用光离子-光电子符合探测方案，优化粒子计数效率。该仪器的特点是详细的，随着其能力说明通过在低温下（< 100 K），包括{光电离光谱}的正丁烷，甲酸二聚体的形成，以及观察由C $_2$ H自由基和C $_2$ H $_2$之间的反应形成的二乙炔分子的检测得到的一些结果。
英文摘要：
A new instrument dedicated to the kinetic study of low-temperature gas phase neutral-neutral reactions, including clustering processes, is presented. It combines a supersonic flow reactor with Vacuum Ultra-Violet (VUV) synchrotron photoionization time of flight mass spectrometry. A photoion-photoelectron coincidence detection scheme has been adopted to optimize the particle counting efficiency. The characteristics of the instrument are detailed along with its capabilities illustrated through a few results obtained at low temperatures (< 100 K) including a {photoionization spectrum} of n-butane, the detection of formic acid dimer formation as well as the observation of diacetylene molecules formed by the reaction between the C$_2$H radical and C$_2$H$_2$.
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