丙酮分子的共振增强多光子电离解离过程的实验研究

An experimental investigation on the resonance enhanced multiphoton ionization and dissociation processes of acetone

报道了在280—286.5nm区域内,通过共振增强多光子电离-飞行时间质谱和质量选择光电离激发谱对丙酮分子的光电离和光解离通道进行了研究,并对部分碎片离子的分质量激发谱进行了归属和标识.实验结果表明,在280—286·5nm紫外光波段内,丙酮分子以母体分子的电离通道为主,即首先电离生成母体离子然后母体离子再吸收光子解离生成碎片离子.

Resonance enhanced multiphoton ionization（REMPI） dissociation channels of acetone were studied using REMPI-TOF-MS and mass-selected excitation spectra in the range of 280-286.5nm. The mass-selected excitation spectra of fragment ions were analyzed and identified. It was shown that the main dissociation channel of acetone is the photoionization of parent molecule firstly in the range of 280-286.5nm, then followed by photodissociation of the parent ion.