Asymmetric photoreaction of amino acid by using circularly polarized undulator and external magnetic field

在广岛同步辐射中心的螺旋波荡器被澄清为准单色和可变波长的光源，具有超过97%的圆偏振，约10^<14>pf的光子通量，因此被证明是不对称光反应的高性能光源。从脉冲星周围的区域，它被证明是从红外到硬X射线的能量范围内的螺旋波荡器辐射的电子被加速和螺旋的感应磁场和脉冲星周围的强磁场。为了同时测定光反应生成的氨基酸的种类和D、L对映体组成，改进了高效液相色谱，使<-14>其鉴定灵敏度达到10 μ mol，<-13>对映体组成达到10 μ mol，用ArF准分子激光或KrCl准分子灯紫外照射有机分子如胺和酰胺的水溶液。氨基酸的形成机制有两种：直接形成游离氨基酸的机制和间接形成氨基酸前体的机制。还鉴定了形成含有起始有机分子的相同碳原子数的氨基酸的选择性。氨基酸的直接和间接产率之比以及氨基酸的倾向性规则对氨的存在很敏感。高分辨质谱分析揭示了氨基酸双链体中含有氮杂环

The helical undulator at the hiroshima synchrotron radiation center was clarified as quasi monochromatic and variable wavelength light source with more than 97 % of circular polarization, about 10^<14> pf photon flux, and therefore was demonstrated as the high performance light source for asymmetric photoreactions. From the region around a pulsar it was demonstrated that helical undulator radiations in the energy range from infrared to hard X-ray are emitted as electrons are accelerated and spiraled by the induced electrie field and strong magnetic field around the pulsar. To determine both the identity and D, L enantiomer composition of amino acids formed by photoreactions, a high performance liquid chromatograph was improved to achieve 10^<-14> mole sensitivity for identification arid 10^<-13> mole for enantiomeric compositionBy using ArF excimer laser or KrCI excimer lamp UV irradiation to aqueous solutions of organic molecules such as amines and amides were carried out. Two types of amino acid formation mechanisms were identified : direct mechanism to form free amino acids and indirect mechanism to farm amino acid precursor that yields amino acids after hydrolysis. Selectivities to form amino acids containing the dame number of carbon atom of the starting organic molecules were also identified. The ratio of the amino acid yield by the direct and that by the indirect mechanism and the propensity rule for the identity of amino acid was found to be sensitive to the presence of ammonia. High resolution massy analysis reveals inclusion of nitrogen heterocycles in amino acid precursbrs