Formation mechanisms of amino acids in simulated interstellar media by high-energy particles irradiation

为了研究在密集的云环境中可能形成的复杂有机化合物，我们用高能粒子（串列加速器的质子或HIMAC，NIRS的重离子）照射一氧化碳，甲醇，甲烷，氨和/或水的混合物来模拟宇宙射线的作用。 当模拟星际介质混合时，直接形成具有高分子量的复杂氨基酸前体。 在产物中还检测到包括五种核酸碱基的嘌呤和嘧啶。 为了研究星际尘埃冰帽中生物有机化合物的形成，设计并建造了一套新的辐照系统。 它由气体混合器、低温恒温室和包括四极质谱仪的分析系统组成。 这些冰将被来自日本KEK数字加速器的重离子辐照。

In order to examine possible formation of complex organic compounds in dense cloud environments, we irradiate mixtures of carbon monoxide, methanol, methane, ammonia, and/or water with high-energy particles (protons from a Tandem accelerator, or heavy ions from HIMAC, NIRS) to simulate the action of cosmic rays. When the simulated interstellar media mixture, complex amino acid precursors with high molecular weights were directly formed. Purines and pyrimidines including the five nucleic acid bases were also detected among the products. In order to study the formation of bioorganic compounds in ice mantles of interstellar dusts, a new irradiation system was designed and constructed. It was composed of a gas mixer, a cryostat chamber and analytical system including a quadrupole mass spectrometer. The ice will be irradiated with heavy ions from the Digital Accelerator in KEK, Japan.