Identification of isomers and control of ionization and dissociation processes using dual-mass-spectrometer scheme and genetic algorithm optimization

Identification of acetone and its two isomers, and the control of their ionization and dissociation processes are performed using a dual-mass-spectrometer scheme. The scheme employs two sets of time of flight mass spectrometers to simultaneously acquire the mass spectra of two different molecules un...

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Bibliographic Details
Published in:Chinese physics B 2015-04, Vol.24 (4), p.162-169
Main Author: 陈洲 佟秋男 张丛丛 胡湛
Format: Article
Language:English
Subjects:
Ionization
Irradiation
Isomers
Lasers
Mass spectra
Mass spectrometers
Mass spectroscopy
Optimization
分离过程
异构体
控制
电离
识别
质谱仪
遗传算法
飞秒激光脉冲
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Summary:Identification of acetone and its two isomers, and the control of their ionization and dissociation processes are performed using a dual-mass-spectrometer scheme. The scheme employs two sets of time of flight mass spectrometers to simultaneously acquire the mass spectra of two different molecules under the irradiation of identically shaped femtosecond laser pulses. The optimal laser pulses are found using closed-loop learning method based on a genetic algorithm. Compared with the mass spectra of the two isomers that are obtained with the transform limited pulse, those obtained under the irradiation of the optimal laser pulse show large differences and the various reaction pathways of the two molecules are selectively controlled. The experimental results demonstrate that the scheme is quite effective and useful in studies of two molecules having common mass peaks, which makes a traditional single mass spectrometer unfeasible.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/4/043303