中国物理B ›› 2004, Vol. 13 ›› Issue (9): 1564-1568.doi: 10.1088/1009-1963/13/9/035

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The dissociative ionization and Coulomb explosion of ethane by a femtosecond laser field

李霞, 任海振, 马日, 陈建新, 杨宏, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2004-01-09 修回日期:2004-05-10 出版日期:2004-06-21 发布日期:2005-06-21
  • 基金资助:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No TG1999075207), and the National Natural Science Foundation of China (Grant Nos 60378012, 10104003, 10328407 and 90101027).

The dissociative ionization and Coulomb explosion of ethane by a femtosecond laser field

Li Xia (李霞), Ren Hai-Zhen (任海振), Ma Ri (马日), Chen Jian-Xin (陈建新), Yang Hong (杨宏), Gong Qi-Huang (龚旗煌)   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • Received:2004-01-09 Revised:2004-05-10 Online:2004-06-21 Published:2005-06-21
  • Supported by:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No TG1999075207), and the National Natural Science Foundation of China (Grant Nos 60378012, 10104003, 10328407 and 90101027).

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摘要： Femtosecond laser-induced dissociation and Coulomb explosion of polyatomic molecule C_2H_6 were systematically investigated using a time-of-flight mass spectrometer and a chirped pulse amplifier laser. With the laser intensity varying from 2.4×10^{15}W/cm^{2} to 1.2×10^{16}W/cm^2, strong molecular ions C_2H_n^+ (n=0－6) and atomic ions C^{m+} (m=1－3) signals were observed. The double-peak structure of atomic ions indicated the occurrence of Coulomb explosion. Compared with the nearly isotropic distribution of C^{+}, highly charged ions C^{m+} (m=2－3) exhibited a sharply anisotropic angular distribution, which was attributed to the geometric alignment.

关键词: field ionization, multiphoton processes, mass spectra

Abstract: Femtosecond laser-induced dissociation and Coulomb explosion of polyatomic molecule C$_2$H$_6$ were systematically investigated using a time-of-flight mass spectrometer and a chirped pulse amplifier laser. With the laser intensity varying from $2.4\times10^{15}$W/cm$^{2}$ to $1.2\times10^{16}$W/cm$^2$, strong molecular ions C$_2$H$_n^+$ ($n$=0－6) and atomic ions C$^{m+}$ ($m$=1－3) signals were observed. The double-peak structure of atomic ions indicated the occurrence of Coulomb explosion. Compared with the nearly isotropic distribution of C$^{+}$, highly charged ions C$^{m+}$ ($m$=2－3) exhibited a sharply anisotropic angular distribution, which was attributed to the geometric alignment.

Key words: field ionization, multiphoton processes, mass spectra

中图分类号:  (Diffuse spectra; predissociation, photodissociation)

  • 33.80.Gj
33.15.Ta (Mass spectra) 33.15.Bh (General molecular conformation and symmetry; stereochemistry)