利用飞行时间质谱仪在超声射流冷却条件下研究了CH3I分子在355 nm激光作用下的多光子电离解离机制.得到了分子的飞行时间质谱,质谱中有较强的H+、CH+3和I+信号,较弱的C+,CH+、CH+2和母体离子CH3I+信号,CH3I+的出现表明CH3I分子的多光子电离解离(MPID)属母体离子阶梯模式:CH3I分子由双光子共振激发到里德堡C态,处于该激发态的母体分子继续吸收光子上泵浦至电离态形成母体离子CH3I+,碎片离子可由母体离子解离形成.同时结合母体离子及碎片离子的出现势对CH3I分子的多光子电离解离通道进行分析,提出了可能的解离电离通道.
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