Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Femtosecond Photoelectron Imaging of N2 at 410 nm

  • Guo, Wei (School of Electric Engineering, University of South China) ;
  • Wei, Shanshan (School of Electric Engineering, University of South China) ;
  • Lu, Xingqiang (School of Nuclear Science and Technology, University of South China) ;
  • Wang, Li (State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics)
  • Received : 2010.06.27
  • Accepted : 2010.10.11
  • Published : 2010.12.20
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Abstract

We experimentally measure the kinetic energy and angular distributions of photoelectrons of $N_2$ as a function of 410 nm femtosecond laser intensity by using velocity map imaging technique. The strong-field multiphoton ionization of molecules shares many of the characteristics with those of atoms. Electron kinetic energies are nearly independent of laser intensities. The independence suggests that the electron peaks in the photoelectron spectrum actually result from a two-step process, indicative of the occurrence of real population in the intermediate states. The relative amplitudes of electron peaks indicate that in the two-step process, nonresonant population transfer dominates for low intensities, while resonant population transfer dominates for higher intensities.

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References

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