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在自行研制的具有恒温加热进样系统的激光质谱仪上获得了260-285 nm波段气相苯胺分子的共振增强多光子电离／飞行时间质谱(REMPI-TOFMS)。结合在266 nm激发波长下得到的C6H7N+、C5H6+、C4H3+、C3H3+、C2H4+及H2CN+离子的光强指数及不同激光能量下各离子信号强度的分支比,对分子离子及主要碎片离子的生成机理进行了探讨:在此波段范围内,苯胺分子首先吸收一个光子跃迁至1B2第一激发态,处于激发态的苯胺分子再吸收一个光子电离生成分子离子C6H7N+,分子离子进一步吸收光子解离为C5H6+、H2CN+、C6H5+,碎片离子C6H5+继续吸收光子解离产生C4H3+、C3H3+、C2H4+,并给出了可能的解离通道。
Resonance enhanced multiphoton ionization / time of flight mass spectrometry (REMPI-TOFMS) of aniline molecules in the 260-285 nm band was obtained on a self-developed laser mass spectrometer with a constant temperature heating system. Combined with the light intensity index of C6H7N +, C5H6 +, C4H3 +, C3H3 +, C2H4 + and H2CN + ions at 266 nm excitation wavelength and the branching ratios of the ion intensities at different laser energies, the formation mechanism of molecular ions and major fragment ions In this band, the aniline molecule firstly absorbs a photon transition to the first excited state of 1B2, the aniline molecule in the excited state absorbs a photon ion to generate molecular ion C6H7N +, and the molecular ion further absorbs the photon dissociation into C5H6 +, H2CN + C6H5 +, fragment ions C6H5 + continue to absorb photons dissociation produce C4H3 +, C3H3 +, C2H4 +, and gives the possible dissociation channel.