R. G. Zeng

Publications (2)4.34 Total impact

• Article: A calculation of backscattering factor database for quantitative analysis by Auger electron spectroscopy

  R. G. Zeng, Z. J. Ding, Y. G. Li, S. F. Mao
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  ABSTRACT: A systematic calculation of the backscattering factor in quantitative analysis by Auger electron spectroscopy has been performed for the primary electron beam of energy from the threshold energy of inner-shell ionization to 30 keV at the incident angle of 0°–89° and for principal Auger transition and Auger electrons emitted from over 28 pure elements at an emission angle of 0°–89° by using a Monte Carlo simulation method. The calculation employs a general definition of backscattering factor, Casnati’s ionization cross section, up-to-date Monte Carlo model of electron scattering, and a large number of electron trajectories to ensure less statistical error. Both the configuration geometry of concentric hemispherical analyzer and the cylindrical mirror analyzer for Auger electron detection are considered in the calculation. The calculated backscattering factors are found to describe very well an experimental dependence of Auger electron intensity on primary energy and on incident angle for Si, Cu, Ag, and W in literature. The calculated numerical values of backscattering factor are stored in an open and online database at http://micro.ustc.edu.cn/BSFDataBase/BFAES.htm.
  Journal of Applied Physics 01/2009; · 2.17 Impact Factor
• Article: Electron inelastic scattering and secondary electron emission calculated without the single pole approximation

  S. F. Mao, Y. G. Li, R. G. Zeng, Z. J. Ding
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  ABSTRACT: In this work, aimed primarily at providing more accurate electron inelastic mean free paths (IMFPs) and stopping powers (SPs) at low energies than are provided by the single pole approximation, the “full Penn” algorithm has been employed to derive the electron inelastic scattering energy loss function in solids. IMFPs and SPs have thus been calculated in the energy range from 1 eV to 10 keV and are in good agreement with the experimental data. This treatment of electron inelastic scattering combined with a consistent model for the cascade secondary electron generation has enabled more elaborate Monte Carlo simulations of secondary electron emission from metals. The calculated results of the energy distributions and the secondary electron emission yields for Al and Cu agree reasonably with experimental results.
  Journal of Applied Physics 01/2009; · 2.17 Impact Factor