中国物理B ›› 1998, Vol. 7 ›› Issue (3): 214-226.doi: 10.1088/1004-423X/7/3/009

• • 上一篇    

AL L CORE EDGE FINE STRUCTURE IN Al, AlN AND α-Al2O3：A COMPARISON OF MICROELECTRON ENERGY LOSS SPECTRA WITH THEORY

樊锡君1, J.S.BOW1, R.W.CARPENTER1, S.H.LIN1, 田淑芬2   

  1. (1)Center for Solid State Science, Arizona State University, Tempe, AZ 85287,U.S.A.; (2)Communication College, Shandong Normal University, Jinan 250014, China
  • 收稿日期:1997-03-18 出版日期:1998-03-20 发布日期:1998-03-20

AL L CORE EDGE FINE STRUCTURE IN Al, AlN AND $\alpha$-Al2O3：A COMPARISON OF MICROELECTRON ENERGY LOSS SPECTRA WITH THEORY

X.J.FAN (樊锡君)a, J.S.BOWa, R.W.CARPENTERa, S.H.LINa, TIAN SHU-FEN (田淑芬)b   

  1. a Center for Solid State Science, Arizona State University, Tempe, AZ 85287,U.S.A.; b Communication College, Shandong Normal University, Jinan 250014, China
  • Received:1997-03-18 Online:1998-03-20 Published:1998-03-20

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摘要： The Al L near-edge fine structures of aluminum and its compounds with nitrogen and oxygen are studied using electron energy loss microspectroscopy in a transmission electron microscope. These edges are normalized to the same scattering cross section per Al atom per electronvolt. The cross section is calculated by using the Born approximation. The contributions to the cross section are from the valence shell crystal states obtained by using the extended Hückel band calculation and the ionization states obtained by using the electron gas model. The chemical effects in the ionization region are taken into account by in cluding the contributions from the elastic backscattering of outgoing plane waves by the atoms that neighbor the excited atoms. The results by theoretical calculation agree semiquantitatively with experimental results.

Abstract: The Al L near-edge fine structures of aluminum and its compounds with nitrogen and oxygen are studied using electron energy loss microspectroscopy in a transmission electron microscope. These edges are normalized to the same scattering cross section per Al atom per electronvolt. The cross section is calculated by using the Born approximation. The contributions to the cross section are from the valence shell crystal states obtained by using the extended Hückel band calculation and the ionization states obtained by using the electron gas model. The chemical effects in the ionization region are taken into account by in cluding the contributions from the elastic backscattering of outgoing plane waves by the atoms that neighbor the excited atoms. The results by theoretical calculation agree semiquantitatively with experimental results.

中图分类号:  (Other metals and alloys)

  • 71.20.Gj
71.20.Ps (Other inorganic compounds) 71.15.Ap (Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)) 68.49.Jk (Electron scattering from surfaces)