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甲醇在激光强度为1013～1014W/cm2,脉冲宽度为80fs的飞秒激光照射下发生解离,产生的碎片离子用飞行时间质谱仪检测。当激光强度较低时,首先出现母体离子CH3OH+.逐渐增加激光强度,母体离子解离产生初级碎片离子.氘代甲醇的实验结果证明此碎片离子是CH2OH+,即甲醇的母体离子首先断C-H键.进一步增加激光强度,母体离子的C—O键也会断裂产生CH3+.当激光强度更高时,出现更小的碎片离子.解离甲醇时,只有H+碎片随激光偏振方向呈现各向异性.这些实验事实表明:甲醇是顺序解离而不是库仑爆炸,激光的电场将该分子中的C-H键拉断.
Methanol was dissociated by laser irradiation at a laser intensity of 1013-1014 W / cm2 and a pulse width of 80 fs, and the resulting fragment ions were detected by time-of-flight mass spectrometry. When the laser intensity is low, the first parent ion CH3OH +. Gradually increase the laser intensity, the parent ion dissociation to produce primary fragment ions. The experimental results of deuterated methanol proved that the fragment ion is CH2OH +, that is, the parent metal of methanol first breaks the CH bond. Further increases in laser intensity result in the cleavage of the C-O bond of the parent ion to CH3 +, with smaller fragment ions occurring at higher laser intensities, and only H + fragments exhibiting anisotropy in the laser polarization direction when dissociating methanol Experimental results show that: methanol is the order of dissociation rather than Coulomb explosion, the electric field of the laser will pull off the CH bond in the molecule.