利用50fs的激光脉冲对氯丙烯在200、400和800 nm下的光电离/解离机理进行了研究.实验获得了氯丙烯在三种波长下的电离质谱和光强指数,分析了母体和碎片离子强度随波长的变化关系.在200 nm,C3H5Cl+来源于飞秒脉冲的直接非共振电离,其它碎片离子均来源于母体离子的电离解离过程;在400 nm,部分分子被激发到高里德堡态从而解离产生C3H5,C3H5再次吸收光子电离导致C3H+5的信号增强;在800 nm,部分分子被同时激发到了排斥态nσ*和多个高里德堡态而发生解离.更多通道产生C3H5使得C3H+产量进一步增加. C3H孝来自C3H5Cl+以及C3H+的电离解离过程,因此C3H+产率随波长变化相对较缓.
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