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Citation: Liu Xiao-Jun, Zhang Bing, Fang Li, Guo Wen-Yue, Zhou Jin-Gang, Cai Ji-Ye, Lu Yi-Qun, Zhou Shi-Kang. Study of the Multiphoton Ionization Mass Spectra of Methylamine[J]. Acta Physico-Chimica Sinica, ;1996, 12(11): 981-985. doi: 10.3866/PKU.WHXB19961105 shu

Study of the Multiphoton Ionization Mass Spectra of Methylamine

1.
Laser Spectroscopy Laboratory,Anhui Institute of Optics and Fine Mechanics,Academia Sinica,Hefei 230031

Received Date: 10 May 1996
Available Online: 15 November 1996

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. CH3NH2+ 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.
- Methylamine,
- Multiphoton ionization and dissociation(MPID),
- Time-of-flight mass spectrometer(TOF-MS)
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