在超声射流冷却条件下 ,利用同步辐射光源 ,结合飞行时间质谱对CH3 NH2 分子在 6 0— 140nm波长范围内的光电离解离进行了研究 .主要动力学过程为母体离子的解离过程 .CH2 NH2 +和CH3 +由CH3 NH2 +在高能量时解离生成 ,而CH2 NH2+的 1,1脱H2 过程则产生其他离子 .CH3 NH2 分子的电离势 (IP)为 9 16± 0 0 1eV ,和分子轨道能量计算的理论值符合得非常好 ,并获得CH3 NH2+和CH2 NH2+的生成热分别为 86 0± 0 5kJ mol和 75 4 1kJ mol. Under the condition of ultrasonic jet cooling, the photoionization dissociation of CH 3 NH 2 in the wavelength range of 60-140 nm was studied by using synchrotron radiation light source and time-of-flight mass spectrometry.The main kinetic process was the dissociation of parent ion.CH 2 NH 2 + And CH3 + are dissociated by CH3NH2 + at high energies, while other ions are produced by the 1,1-removal of CH2NH2 +, the ionization potential (IP) of CH3NH2 is 9 16 ± 0 0 1eV and the molecular The calculated theoretical values ​​of orbital energies agree well with the yields of CH3 NH2 + and CH2 NH2 + of 86 0 ± 0 5 kJ mol and 75 4 1 kJ mol, respectively.