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在 2 4 3～ 2 6 3nm紫外光波段通过质量选择光电离激发谱研究了丙酮 (CH3COCH3)的光化学反应通道。分析母体离子CH3COCH3+ 和碎片离子CH3CO+ 、CH3+ 的光电离激发谱和质谱峰宽可以知道 :此光波段丙酮分子的光化学反应主要包括了丙酮分子经由 (S1,T1)中间态产生母体离子的(1+1)双光子电离通道 ,母体离子进一步解离产生碎片离子CH3+ 的“光电离 -光解离”通道和丙酮分子经由 (S1,T1)中间态解离成中性自由基碎片CH3CO后再进一步被双光子电离的“光解离 -光电离”通道。由母体离子光电离激发谱双光子阈值波长 (2 55.6 7nm)给出的丙酮电离势 (IP)为 (9.6 96± 0 .0 0 4 )eV。
The photochemical reaction channels of acetone (CH3COCH3) were studied by mass selective photoelectron spectroscopy in the wavelength range of 214-426 nm. The photochemical ionization spectra and peak widths of CH3COCH3 +, CH3CO + and CH3 + of the parent ion can be known as follows: The photochemical reaction of acetone molecules in this light band mainly includes (1+ 1) Two-photon ionization channel, the parent ion further dissociates to generate fragment ion CH3 + “photo-ionization-photodissociation” channel and acetone molecules through the (S1, T1) intermediate state dissociation into neutral free radical fragments CH3CO and then further Two-photon Ionization “Photodissociation - Photoionization” Channel. The ionization potential (IP) of acetone given by the two-photon threshold wavelength (2 55.6 7 nm) from the parent ion photoexcitation spectra was 9.6 96 ± 0. 0 0 4 eV.