J4 ›› 2008, Vol. 25 ›› Issue (6): 675-680.

• 论文 • 上一篇    下一篇

355nm激光作用下间甲苯酚的多光子电离质谱研究

李晓明,孔祥和,张树东,卜文峰,赵永焕,刘在国   

  1. 曲阜师范大学物理工程学院
  • 发布日期:2009-04-25
  • 基金资助:
    曲阜师范大学博士科研启动基金资助

Study on multiphoton ionization mass spectra of m-methylphenol at 355 nm

LI Xiao-Meng, KONG Xiang-He, ZHANG Shu-Dong, BO Wen-Feng, DIAO Yong-Huan, LIU Zai-Guo   

  • Online:2009-04-25

摘要:

利用355nm激光作为光源对间甲苯酚分子进行了多光子电离解离研究,得到了间甲苯酚分子的多光子电离飞行时间质谱图,实验中没有观测到母体离子信号。对其中的部分产物离子进行分析,得出了该波长下主要的解离电离通道。应用从头计算理论,在B3LYP/6-311++G(d,p)基组水平上对质荷比为109(C7H8OH+)离子及C7H8O的可能构型进行优化,得到了其稳定构型。对C7H8OH+离子势能面的研究得到,C7H8OH+离子的形成是一个无势垒的反应过程。

关键词: 光谱学, 多光子电离, 飞行时间质谱, 从头算, 间甲苯酚

Abstract:

Using 355 nm laser as excitation source,m-methylphenol multiphoton ionization and disso- ciation(MPID)was studied,m-methylphenol time-of-flight mass spectra of multiphoton ionization were obtained,There is no parent ion detected.The main possible dissociation and ionization channels were analysed.Using ab initio calculation to optimize the geometric structures of C7H8OH+ and C7H8OH at B3LYP/6-311++G(d,p)level,the stable structures are obtained.By exploring the potential energy surface of C7H8OH+,that the formation of C7H8OH+ is a reaction process without potential barrier is concluded.

Key words: spectroscopy, multiphoton ionization, time-of-flight mass spectra, ab initio calculation, m-methylphenol