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Electron Scattering In Diamond as a Function of Thickness

Published online by Cambridge University Press:  02 July 2020

David C. Bell
David C. Bell*
Affiliation:
Center for Materials Science and Engineering, Massachusetts Institute of Technology Cambridge, MA, 02139
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Background

The electron energy-loss spectrum of a single crystal diamond wedge has been examined, with particular reference to the excitation of plasmon oscillations in the bulk of a diamond crystal. The electron energy-loss spectrum has been previously studied [1], and in particular the ‘low-lo ss’ region of the spectrum shows a number of important features, Fig. 1. The main feature in the energy-loss spectrum is a peak at ∼ 33 eV which corresponds to a plasma resonance of valence electrons. Diamond has 4 valence electrons which yields a value of Ep = 31.0 eV. The upward shift in the resonance energy to 33 eV is caused by single-electron excitation at lower energy-loss values. An important feature is the “bump” at about 23 eV, which has been shown to be an interband transition [2].

Type
Electron Diffraction and Scattering
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 338 - 339
Copyright
Copyright © Microscopy Society of America

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References

1.Egerton, R.F. and Whelan, M.J., Phil. Mag. 30 739–749, (1974)CrossRefGoogle Scholar
2.Bell, D.C. and Spargo, A.E.C, Phys. Rev. Letters B. in Publication.Google Scholar
3.Egerton, R.F., Electron Energy-Loss Spectroscopy in the Electron Microscope, (Plenum Press Publishers, New York, 1996)CrossRefGoogle Scholar
4. Dr. Chapman, J., Argyle Diamond Mines (CRA), Western Australia.Google Scholar
5.Bell, David C., Garratt-Reed, Anthony J. and Linn Hobbs, W., Proc. of the Materials Research Society Meeting (Fall 1997), Vol. 504.Google Scholar
6. I am grateful for the assistance provided by Dr. Anthony J. Garratt-Reed. This work was completed at the Center for Materials Science and Engineering, at The Massachusetts Institute of Technology, which is funded by National Science Foundation grant DMR-9400334.Google Scholar