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Chin. Phys. B, 2015, Vol. 24(4): 043303    DOI: 10.1088/1674-1056/24/4/043303
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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

Chen Zhou (陈洲), Tong Qiu-Nan (佟秋男), Zhang Cong-Cong (张丛丛), Hu Zhan (胡湛)
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
Abstract  

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.

Keywords:  shaped femtosecond pulse      identification      ionization and dissociation  
Received:  07 October 2014      Revised:  05 November 2014      Accepted manuscript online: 
PACS:  33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))  
  42.25.Kb (Coherence)  
Fund: 

Project supported by the National Basic Research Program of China (Grant No. 2013CB922200) and the National Natural Science Foundation of China (Grant No. 11374124).

Corresponding Authors:  Hu Zhan     E-mail:  huzhan@jlu.edu.cn

Cite this article: 

Chen Zhou (陈洲), Tong Qiu-Nan (佟秋男), Zhang Cong-Cong (张丛丛), Hu Zhan (胡湛) Identification of isomers and control of ionization and dissociation processes using dual-mass-spectrometer scheme and genetic algorithm optimization 2015 Chin. Phys. B 24 043303

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