Dissociative Photoionization of Heterocyclic Molecule-Morpholine under VUV Synchrotron Radiation  

杂环分子-吗啉在同步辐射真空紫外光下的光电离解离研究（英文）

作　　者：Wen-tao Song Yong-jun Hu Shan Jin Yu-jian Li 宋文韬;胡勇军;金山;李裕健(华南师范大学光子学学院激光生命科学研究所激光生命科学教育部重点实验室广州光谱分析与功能探针重点实验室)

机构地区：[1]MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, and Guangzhou Key Laboratory of spectral analysis and functional probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China

出　　处：《Chinese Journal of Chemical Physics》2019年第2期259-266,I0003,I0004-I0005,共10页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China (No.U1732146 and No.21273083);the Scientific and Technological Planning Project of Guangzhou City (No.201805010002)

摘　　要：The radiation damage of biomolecules, in particular with aliphatic compound, has been extensively studied. Morpholine is a typical six-membered aliphatic heterocyclic compound. In the present work, photoionization and dissociation of the morpholine monomer and subsequent fragmentations have been investigated by synchrotron vacuum ultraviolet photoionization mass spectrometry and theoretical calculations. The vertical ionization energy of morpholine monomer is 8.37±0.05 eV, which agrees reasonably well with a theoretical value 8.41 eV of morpholine. Experimentally observed fragmentation of morpholine (m/z=87 amu) gives rise to m/z=86 amu, m/z=57 amu, and m/z=29 amu. Based on experimental and theoretical results, it is found that the m/z=86 amu is produced by losing H atom, the m/z=57 amu is formed by the elimination of CH2O with a ring-opening process, the m/z=29 amu is generated by further dissociation of the fragment m/z=57 amu (C3H7N)+ by the elimination of C2H4. This finding would provide valuable insight into the photo-damage of aliphatic compounds, which may be related to living cells and other biological system.

关 键 词：PHOTOIONIZATION DISSOCIATION MORPHOLINE Gas phase 

分 类 号：O626[理学—有机化学]