原子与分子物理学报2007，Vol.24Issue(3)：605-608,4.
532 nm激光作用下CH3I分子的多光子电离
Multiphoton ionization of CH3I in the wavelength of 532 nm
李丽 1孔祥和 1张树东 1刘存海 1孙志青 1刘建苹 1张良芳 1乔光1
作者信息
摘要
Abstract
The processes and mechanism of multiphoton ionization (MPI) and dissociation of CH3I have been discussed under supersonic beam conditions at 532 nm by using time-of-flight mass spectrometer.The MPI mass spectrum consists of strong signals of I+ and CH3+,together with weak signals of CH3I+,CHn+(n≤2),C+ and H+.There is no change of the alignment of the spectra at different laser energies.The processes of ionization of CH3I include two different excitation pathways at 532 nm.One way is that CH3I molecule is two-photon resonantly excited to A-band and then goes through dissociation to form CH3 and I fragments.Fragments ions are produced by ionization neutral fragments;the other process is that CH3I molecule is three-photon resonantly excited to Rydberg state,and then ionized through additional two-photon absorption to form CH3I+.In succession,a part of parent ions dissociate to produce fragment ions.关键词
多光子电离/光解/碘甲烷/飞行时间质谱Key words
multiphoton ionization/photodissociation/methyl iodide/time-of-flight mass spectrum分类
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李丽,孔祥和,张树东,刘存海,孙志青,刘建苹,张良芳,乔光..532 nm激光作用下CH3I分子的多光子电离[J].原子与分子物理学报,2007,24(3):605-608,4.
