物理化学学报 >> 1988, Vol. 4 >> Issue (02): 182-186.doi: 10.3866/PKU.WHXB19880213

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丙酮在XeCl准分子激光辐射下的多光子电离和碎裂研究

刘厚祥; 李书涛; 韩景诚; 关一夫; 朱荣; 吴存恺   

  1. 中国科学院安徽光机所激光光谱学实验室
  • 收稿日期:1986-08-26 修回日期:1987-07-22 发布日期:1988-04-15
  • 通讯作者: 刘厚祥

MULTIPHOTON IONIZATION AND FRAGMENTATION STUDY OF ACETONE AT XeCl EXCIMER LASER RADIATION

Liu Houxiang*; Li Shutao; Han Jingcheng; Guan Yifu; Zhu Rong; Wu Cunkai   

  1. Laboratory of Laser spectroscopy; Anhui Institute of Optics and Fine Mechanics; Academia Sinica
  • Received:1986-08-26 Revised:1987-07-22 Published:1988-04-15
  • Contact: Liu Houxiang

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摘要： 我们用扩散分子束多光子电离光谱技术研究了丙酮在XeCl准分子激光辐射下的多光子电离和碎裂行为。实验表明丙酮没有产生母体离子峰(m/e=58), 只给出m/e=43和15两个峰, 分别对应于丙酮光解所产生的两个碎片CH_3 CO和CH_3。其离子信号(1)分别与激光强度(Ⅰ)的3和3.6次方成正比。分析表明离子是由中性碎片电离产生的。

Abstract: Multiphoton ionization and fragmentation of acetone at 308nm laser radiation are studied by using diffuse molecular beam and multiphoton ionization mass spectroscopy. It is found that no parent ions of acetone are produced, but only the frag ment ions at m/e=15 and 43, corresponding to two neutral fragments of CH_3 and CH_3CO generated by photodissociation of acetone, respectively. The inten sities of these ions are proportional to the 3.6th and 3.0th power of the laserintensity, respectively. We argue that these fragment ions are from the ionization of the neutral radicals CH_3 and CH_3CO.