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Study on Photochemical Reaction Channels of Acetone in the Range 243~263nm
Zhang Limin,Chen Huzhen,Chen Jun,Xu Haifeng,Dai Jinghua,Liu Shilin,Ma Xingxiao
Author NameAffiliationE-mail
Zhang Limin Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 lmzha@ustc.edu.cn  
Chen Huzhen Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Chen Jun Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Xu Haifeng Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Dai Jinghua Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Liu Shilin Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Ma Xingxiao Laboratory for Bond-selective Chemistry, Chinese Academy of Science,Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Abstract:
The multi-photon ionization processes of acetone in the range 243~263nm have been studied using mass-resolved excitation spectra. From the analysis to the excitation spectra and the mass peak widths of CH3COCH3+, CH3CO+ and CH3+, the photochemical reactions of acetone in this range are suggested as follows. The CH3COCH3+ signals in the shorter wavelength range of λ<255.67nm are due to the (1+1) photon ionization channels of acetone via (S1, T1) state of acetone. The fragment ion CH3+ comes from the dissociation of parent ion CH3COCH3+. The non-resonance spectral structure of fragment ion CH3CO+ comes mainly from the ionization of acetyl (CH3CO) produced by one-photon dissociation of acetone via (S1, T1) state. We also deduced the IP of (9.696±0.004)eV for acetone from the spectra of CH3COCH3+.
Key words:  CH3COCH3, Photon ionization-photon dissociation, Mass spectroscopy
FundProject:国家自然科学基金资助项目(29773043)和国家95攀登计划“分子反应动态学和原子分子激发态”资助 项目
243~263nm CH3COCH3的多光子电离研究
张立敏*,陈鹄珍,陈军,徐海峰,戴静华,刘世林,马兴孝
摘要:
在243~263nm紫外光波段通过质量选择光电离激发谱研究了丙酮(CH3COCH3)的光化学反应通道。分析母体离子CH3COCH3+和碎片离子CH3CO+、CH3+的光电离激发谱和质谱峰宽可以知道:此光波段丙酮分子的光化学反应主要包括了丙酮分子经由(S1,T1)中间态产生母体离子的(1+1)双光子电离通道,母体离子进一步解离产生碎片离子CH3+的“光电离-光解离”通道和丙酮分子经由(S1,T1)中间态解离成中性自由基碎片CH3CO后再进一步被双光子电离的“光解离-光电离”通道。由母体离子光电离激发谱双光子阈值波长(255.67nm)给出的丙酮电离势(IP)为(9.696±0.004)eV。
关键词:  CH3COCH3  光电离-光解离  质谱
DOI:10.1088/1674-0068/14/2/135-140
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