Studies for the reaction rates of radicals in interstellar space and planetary atmosphere

用LIF法测定了C_2H自由基的反应速率。C_2H在星际空间或行星大气的光化学过程中起着重要的作用。测量到的LIF信号基于C_2H的B态，并观察到四个光谱序列。这些光谱可以分别分配为toΣ-Σ，Π-Π，Δ-Δ，Ф-Ф跃迁。详细的光谱分析表明，测定了C_2H的电子态性质和与乙炔的反应速率。另一方面，在10K条件下，用氩基法研究了低温固相下C_2H自由基的光化学过程。在C_2H与乙炔的反应中观察到二乙炔的生成。量子产率大于1。这意味着低温固相中发生了纳米爆炸。它对星际空间或行星大气中不饱和烃自由基的反应机理具有重要意义。

The reaction rates of C_2H radicals have been measured using the LIF method. The C_2H plays an important role for the photochemical process in interstellar space or planetary atmosphere. The measured LIF signal is based on B state of C_2H, and four spectra series was observed. These spectra can be assigned toΣ-Σ,Π-Π,Δ-Δ,Ф-Ф transition, respectively. The detailed analysis of a spectrum shows that the properties of the electronic state of C_2H and reaction rate with acetylene have be determined. On the other hand, photochemical process of C_2H radical in solid phase at low temperature has been investigated using the argon matrix method at 10K. Diacetylene formation was observed in the reaction C_2H with acetylene. The quantum yield is over one. This means that there are nano explosion occurs in the low temperature solid phase. It has a big meaning in the reaction mechanism of the unsaturated hydrocarbon expected to be radical in interstellar space or the planetary atmosphere.