Experimental Investigation on Resonance-Enhanced Multiphoton Ionization of Methylamine
By means of time of flight (TOF) mass spectrometry, multi-photon ionization dissociation kinetics is employed in the paper to study methylamine molecules within the wavelength of 280-287.5nm under supersonic jet condition. The analysis of result achieved in TOF mass spectrometry and sub-excitation spectrum shows that the primary process of multi-photon dissociation and ionization of methylamine molecules within the wavelength of 280-287.5nm is that through a electron repulsion state one photon absorbed by parent molecule resonance is dissociated into neutral CH2NH2 fragments. Then the neutral CH2NH2 dissociation fragments absorb photon, causing (1+1) resonant multi-photon ionization to generate excited states of CH2NH2+ fragments. CH2NH2+ under the pre-dissociation electronic excited state is dissociated further into ion fragments like CH2CH+,CHNH+,CNH+(CHN+), while the feeble parent ion signal is formed through absorbing two photon ionization after the parent molecule absorbed a photon to reach an electronic repulsion state.
methylamine resonance-enhanced multiphoton ionization dissociation - ionization channel
chuanmei Du mingxu Zhang ying Xu xiuquan Ni hengliang Zhou
School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan ,Anhui ,China
国际会议
三峡
英文
3170-3172
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）