Catalytic Role of H I in the Interstellar Synthesis of Complex Organic Molecule  

作　　者：Shuming Yang Peng Xie Enwei Liang Zhao Wang 

机构地区：[1]Laboratory for Relativistic Astrophysics,Department of Physics,Guangxi University,Nanning 530004,China [2]School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China

出　　处：《Research in Astronomy and Astrophysics》2023年第5期213-220,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (11964002)。

摘　　要：Using quantum chemical calculations,we model the pathways for synthesizing two purine nucleobases,adenine and guanine,in the gas-phase interstellar environment,surrounded by neutral atomic hydrogen(H I).H I is found active in facilitating a series of fundamental proton transfer processes of organic synthesis,including bond formation,cyclization,dehydrogenation,and H migration.The reactive potential barriers were significantly reduced in the alternative pathways created by H I,leading to a remarkable increase in the reaction rate.The presence of H I also lowered the reactive activation temperature from 757.8 K to 131.5–147.0 K,indicating the thermodynamic feasibility of these pathways in star-forming regions where some of the reactants have been astronomically detected.Our findings suggest that H I may serve as an effective catalyst for interstellar organic synthesis.

关 键 词：astrochemistry-astrobiology-ISM MOLECULES 

分 类 号：P148[天文地球—天体物理]