【摘要】 用多光子电离飞行时间质谱法，利用可调谐脉冲激光器，测得了甲胺分子在不同激光波长和激光功率下的多光子电离和解离产物，主要产物（CH3NH2+、CH2NH2+、CHNH2+、CH2N、CHNH2+、CH2NH+、CHNH+）经历了一个2＋2共振多光子电离过程，CH2NH2+离子源于母体离子CH3NH2+的离解，CHNH2+（CH2NH+）和CHNH+离子则归因于CH2NH2+离子的进一步离解，母体离子CH3NH2+的离解速率常数随激发波长的增大而减小。更多还原

【Abstract】 Multiphoton ionization-dissociation process of Methylamine Molecules is studied using Time-Of-Flight mass spectrometer with a pulsed dye laser. Four ion peaks observed under different laser wavelength and laser power are assigned to CH3NH2+、CH2NH2+、 CHNH2+ (CH2NH+) and CHNH+. Based on the experimental results,the Multiphoton lonization and Dissociation(MPID) mechanism of CH3NH2 are discribed:CH3NH2 molecule is ionized to generate CH3NH2+ via 2+2 photon(two photon resonant excitation and two photon ionization)process. CH3NH2t dissociate to produce CH2NH2+,CHNH2+(CH2NH+) and CHNH+ are generated by the consequent dissociation of CH2NH2+.The experimental results indicate that the dissociation rate constant of CH3NH2+ decreases as laser wavelength increases.更多还原