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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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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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Multiphoton Ionization (MP) Mass Spectra of n-C3H7I AND i-C3H7I are obtained using a time-offlight mass spectrometer at 532 nm. No parentions are observed in MPI of both isomers. N-propyl cation dissociates more extensively than isopropyl cation. The C2H+5(M/Z=29) ion is observed instead of C2H+4(M/Z=28) ion in MPI of n-C3H7I, in contrast to i-C3H7I. It is found that parent molecules are first two-photon resonantly excited to A-band, then go through dissociation. Fragment ions are produced by ionization and dissociation of neutral fragments. We present directly the diss ociation pathways of n-propyl cation according to the results proposed by Levine using maximum entropy formalism. Moreover, those of isopropyl cation are discussed in this paper through branching ratio analyses. 相似文献
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Multiphoton Ionization (MP) Mass Spectra of n-C3H7I AND i-C3H7I are obtained using a time-offlight mass spectrometer at 532 nm. No parentions are observed in MPI of both isomers. N-propyl cation dissociates more extensively than isopropyl cation. The C2H+5(M/Z=29) ion is observed instead of C2H+4(M/Z=28) ion in MPI of n-C3H7I, in contrast to i-C3H7I. It is found that parent molecules are first two-photon resonantly excited to A-band, then go through dissociation. Fragment ions are produced by ionization and dissociation of neutral fragments. We present directly the diss ociation pathways of n-propyl cation according to the results proposed by Levine using maximum entropy formalism. Moreover, those of isopropyl cation are discussed in this paper through branching ratio analyses. 相似文献
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