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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。
We used diffusion molecular beam multiphoton ionization spectroscopy to study the multiphoton ionization and fragmentation behavior of acetone under XeCl excimer laser irradiation. Experiments show that acetone has no parent ion peak (m / e = 58). Only two peaks at m / e = 43 and 15 are obtained, corresponding to two fragments CH_3CO and CH_3 produced by acetone photolysis respectively. The ion signal (1) is proportional to the 3rd and 3rd power of laser intensity (I), respectively. Analysis shows that ions are generated by ionization of neutral fragments.