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碘代烷烃在532 nm激光作用下多光子电离解离机理 总被引:3,自引:0,他引:3
利用532nm的激光对碘代烷烃(碘甲烷、碘乙烷、碘代正丙异丙烷)分子作了多光了电离解离(MPID)质谱(MS)研究,在532nm激光作用下,CH3I分子吸收532nm激光双光子的能量,进入A带的IA2态,继续吸收光子上泵浦至电离态形成母体离子CH3I,然后再形成碎片离子;而其它几个碘代烷烃吸收双光子的能量进入A带后均形成中性碎片,中性碎片再吸收光子经一系列电离解离形成碎片离子,此外,本文还通过对同 相似文献
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二乙胺分子的多光子电离:\"梯转换\"过程 总被引:1,自引:0,他引:1
The multiphoton ionization (MPI) of diethylamine is first reported in this paper. A time-of-flight mass spectrometer was used in the experiment under collision-free condition. MPI mass spectra were measured in the region of 464 ~486 nm using a dye laser and at double frequency of a Nd:YAG laser. Molecular ion was created through resonance enhanced multiphoton ionization (REMPI) via Rydberg states. Fragment, ion distribution was formed through “ladder switching” process. The experimental demonstration of the process is reported for the first time by the discussion of dependence of ion relative, abundance on laser wavelength and energy. The competition between further up-pumping and fragmentation of Parent ion also exists, and higher laser intensity favors the former. 相似文献
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1引言呋喃分子在450nm附近的多光子电离实验中[1],质谱中观察不到母体离子C4H4O+,主要碎片离子的相对丰度C+>C2+=CHO+=C3H3+.这些离子的选质量光谱研究表明它们是呋喃分子先吸收3+1个光子电离为母体离子C4H4O+,然后C4H4O+再进一步吸收光子逐步解离产生.陕哺离子的初级解离过程已比较清楚[2-4],吹响离子能量在1~5eV之间解离通道是:这三个平行解离反应可用RRKM理论来描述[4].但是陕哺离子在高能量下的解离反应,特别是次级解离过程还不清楚,因此无法确定MPIF实验中观察到小离子碎片产生的机理,为此本文在速… 相似文献