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Ionizations and fragmentations of benzene, methylbenzene, and chlorobenzene in strong IR and UV laser fields |
| Zhang Jun-Feng (张军峰)a b, Lü Hang (吕航)a b, Zuo Wan-Long (左万龙)a b, Xu Hai-Feng (徐海峰)a b, Jin Ming-Xing (金明星)a b, Ding Da-Jun (丁大军)a b |
a Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
b Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China |
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Abstract Ionizations and fragmentations of benzene, methylbenzene, and chlorobenzene are studied in linearly polarized 50-fs, 800-nm and 400-nm strong laser fields using a time-of-flight mass spectrometer. It is shown that at low laser intensity, the parent ions are dominant for any one of the molecules in an 800-nm strong laser field, while extensive fragmentation is observed in a 400-nm laser field, which can be understood by the resonant photon absorption of molecular cations. The ratio of the yield of the parent ion to the yield of the total ion for each molecule is measured as a function of laser intensity in a range from 1.0×1013 W/cm2 to 4.0×1014 W/cm2, in either the 800-nm or 400-nm laser field. The results show that the fragmentation of the aromatic molecules increases significantly as the laser intensity is increased. Possible mechanisms for fragmentation in strong laser fields are discussed. Finally, the saturation intensity of ionization of the titled molecules is also determined.
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Received: 19 May 2015
Revised: 05 July 2015
Accepted manuscript online:
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PACS:
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33.80.Rv
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(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB922200) and the National Natural Science Foundation of China (Grant No. 11274140). |
Corresponding Authors:
Lü Hang, Xu Hai-Feng
E-mail: lvhang0811@sina.com;xuhf@jlu.edu.cn
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Cite this article:
Zhang Jun-Feng (张军峰), Lü Hang (吕航), Zuo Wan-Long (左万龙), Xu Hai-Feng (徐海峰), Jin Ming-Xing (金明星), Ding Da-Jun (丁大军) Ionizations and fragmentations of benzene, methylbenzene, and chlorobenzene in strong IR and UV laser fields 2015 Chin. Phys. B 24 113301
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