Study of the Multiphoton Ionization Mass Spectra Methylamine

被引：6

作者：

Liu Xiaojun ^{[1
]}

Zhang Bing ^{[1
]}

Fang Li ^{[1
]}

Guo Wenyue ^{[1
]}

Zhou Jingang ^{[1
]}

Cai Jiye ^{[1
]}

Lu Yiqun ^{[1
]}

Zhou Shikang ^{[1
]}

机构：

[1] Acad Sinica, Anhui Inst Opt & Fine Mech, Laser Spect Lab, Hefei 230031, Peoples R China

来源：

ACTA PHYSICO-CHIMICA SINICA | 1996年 / 12卷 / 11期

关键词：

Methylamine; Multiphoton ionization and dissociation(MPID); Time-of-flight mass spectrometer(TOF-MS);

D O I：

10.3866/PKU.WHXB19961105

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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+ center dot CH2NH2+ center dot 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.

引用

页码：981 / 985

页数：5

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