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Citation: Li Hai-Yang, Mo Hua-Ping, Bai Ji-Ling, Dai Dong-Xu. Laser Dissociation of Methyl Nitrite Around 440nm[J]. Acta Physico-Chimica Sinica, ;1995, 11(01): 87-91. doi: 10.3866/PKU.WHXB19950118 shu

Laser Dissociation of Methyl Nitrite Around 440nm

1.
State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Physical Chemistry,Chinese Academy of Sciences,Dalian 116023

Received Date: 19 November 1993
Available Online: 15 January 1995

The collision-free multiphoton ionization and dissociation of jet cooling methyl nitrite (CH3ONO) were studied by using intense dye laser around 440nm. NO+ ion peak in the TOF mass spectrum was obtained under different accelerating electric field and different angle (χ) between laser polarization plane and the axis of the flight tube. NO+ peak is broadened when NO comes from the dissociation of CH3ONO and this broadening becomes more apparent under lower accelerating electric field. NO+ peak shape is also influenced by the property of laser polarization. If the accelerating electric field is low enough, there are three peaks when χ=0℃ and only one peak when χ=90℃. These phennomena can be explained by CH3ONO’s two-photon transition from S0 to S2 repulsive state. NO thus produced has a large velocity parallel to the laser polarization plane.
- Methyl nitrite,
- Multphoton ionization,
- Photofragmentation mechanism,
- Time of flight mass spectrometer
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