Coulomb explosion and dissociative ionization of 1,2-dibromoethane under an intense femtosecond laser field

被引：8

作者：

Wu, Hua ^{[1
]}

Zhang, Shian ^{[1
]}

Yang, Yan ^{[1
,2
]}

Sun, Shengzhi ^{[1
]}

Zhang, Jian ^{[1
]}

Deng, Li ^{[1
]}

Jia, Tianqing ^{[1
]}

Wang, Zugeng ^{[1
]}

Sun, Zhenrong ^{[1
]}

机构：

[1] E China Normal Univ, Dept Phys, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

来源：

RSC ADVANCES | 2014年 / 4卷 / 85期

关键词：

DOWN ABSORPTION-SPECTROSCOPY; CONCERTED 3-BODY FORMATION; BR BOND FISSION; ULTRAVIOLET PHOTODISSOCIATION; ATMOSPHERIC BROMINE; MOLECULAR-OXYGEN; 1ST CONTINUUM; 248; NM; ION; ELIMINATION;

D O I：

10.1039/c4ra06121g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Coulomb explosion and dissociative ionization of 1,2-dibromoethane are experimentally investigated in a near-infrared (800 nm) femtosecond laser field by dc-slice imaging technology. The sliced images of the fragment ions C2H4Br+, Br+, C2H4+, Br-2(+) and CH2Br+ are obtained, and their corresponding kinetic energy releases (KERs) and angular distributions are calculated. It is confirmed that the high-KER components come from Coulomb explosion of 1,2-C2H4Br22+, while the low-KER components come from dissociative ionization of 1,2-C2H4Br2+. Furthermore, the dissociation pathway leading to C2H4+ and Br-2 is theoretically simulated, and the results show that the singly charged precursor overcomes an energy barrier to dissociate via an asynchronous concerted mechanism after undergoing isomerization.

引用

页码：45300 / 45305

页数：6

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