ENERGY-LOSS FUNCTIONS DERIVED FROM REELS SPECTRA FOR ALUMINUM
来源期刊：Acta Metallurgica Sinica2005年第3期
论文作者：K. Salma X. Sun K.Goto R. Shimizu T. Koshikawa H.M.Li Z.J.Ding Z.M.Zhang
Key words：effective energy loss function; Monte Carlo simulation; extended Landau approach; reflection electron energy loss spectroscopy; aluminum;
Abstract: The effective energy loss functions for Al have been derived from differential inverse inelastic mean free path based on the extended Landau approach. It has been revealed that the effective energy loss function is very close in value to the theoretical surface energy loss function in the lower energy loss region but gradually approaches the theoretical bulk energy loss function in the higher energy loss region. Moreover, the intensity corresponding to surface excitation in effective energy loss functions decreases with the increase of primary electron energy. These facts show that the present effective energy loss function describes not only surface excitation but also bulk excitation. At last, REELS spectra simulated by Monte Carlo method based on use of the effective energy loss functions has reproduced the experimental REELS spectra with considerable success.
K. Salma1，X. Sun1，K.Goto2，R. Shimizu3，T. Koshikawa4，H.M.Li1，Z.J.Ding1，Z.M.Zhang1
(1.Structure Research Laboratory and Department of Physics, University of Science and Technology of China,The Chinese Academy of Sciences, Hefei 230026, China;
2.Department of Systems Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan;
3.Department of Information Science, Osaka Institute of Technology, Osaka 573-0196, Japan;
4.Ftmdamental Electronics Research Institute, Osaka Electro-Communication University, Osaka 572-8530, Japan)
Abstract:The effective energy loss functions for Al have been derived from differential inverse inelastic mean free path based on the extended Landau approach. It has been revealed that the effective energy loss function is very close in value to the theoretical surface energy loss function in the lower energy loss region but gradually approaches the theoretical bulk energy loss function in the higher energy loss region. Moreover, the intensity corresponding to surface excitation in effective energy loss functions decreases with the increase of primary electron energy. These facts show that the present effective energy loss function describes not only surface excitation but also bulk excitation. At last, REELS spectra simulated by Monte Carlo method based on use of the effective energy loss functions has reproduced the experimental REELS spectra with considerable success.
Key words:effective energy loss function; Monte Carlo simulation; extended Landau approach; reflection electron energy loss spectroscopy; aluminum;
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