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紫外激光作用下环氧乙烷的TOF质谱研究
引用本文:钱谊乐,余技广.紫外激光作用下环氧乙烷的TOF质谱研究[J].光学学报,1992,12(1):3-36.
作者姓名:钱谊乐  余技广
作者单位:中国科学院安徽光机所激光光谱学实验室 合肥230031 (钱谊乐,方黎,郑海洋,赵亚萍,吴存恺),复旦大学物理二系 上海200433 (余技广),复旦大学物理二系 上海200433(秦启宗)
摘    要:本文采用超声分子束技术,分别在308nm和355nm的紫外激光下,对环氧乙烷分子进行了多光子电离飞行时间(TOF)质谱研究.在308nm激光作用时,观测到C_2H_4O~+、C_2H_3O_+、CHO~+和CH_3~+等离子的信号;在355nm激光作用时,则没有观测到分子离子的信号.在两种激光作用下最强的信号都是CHO~+.但是两种激光下各碎片离子信号的光强指数有一定差别,表明在两种情形下,环氧乙烷分子经历了不同的电离解离过程.

关 键 词:多光子  电离  解离  TOF质谱  激光
收稿时间:1990/12/24

UV laser MPID time-of-f light mass spectra study on Oxirane
QIAN YILE,FANG LI,ZHENG HAIYANG,ZHAO YAPING AND WU CUNKAI.UV laser MPID time-of-f light mass spectra study on Oxirane[J].Acta Optica Sinica,1992,12(1):3-36.
Authors:QIAN YILE  FANG LI  ZHENG HAIYANG  ZHAO YAPING AND WU CUNKAI
Abstract:We studied the Multiphoton Ionization Dissociation (MPID) time-of-flight mass spectra of oxirane with ultrasonic molecular beam system at 308 nm and 355 nm laser radiation. In our experiments, the mass spectra distributions showed a certain extend of difference between two conditions. Under 355 nm laser radiation, there is no molecular ion signal and under 308nm we got a high laser intensity index for each fragment ions. Differing from electron impact ionization, the most intensive ion signal came from CHO+. With the laser intensity dependence of each fragment ion and its branch ratio we investigated the MPID process and mechanism of Oxirane at these two laser radiatios.
Keywords:inultiphoton ionization dissociation  time-of-flight mass spectra    
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