Methods of calculating the band structure and low-energy secondary electron spectroscopy of iridium |
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Authors: | O F Panchenko |
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Institution: | (1) A. A. Galkin Donetsk Physicotechnical Institute, Ukrainian National Academy of Sciences, 340114 Donetsk, Ukraine |
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Abstract: | A theoretical interpretation is put forward for the fine structure of the secondary electron emission spectra of Ir normal
to the (111) surface and the total current spectrum of an Ir polycrystal. The calculations took into account the energy dependence
of the broadening of the energy band levels, the electron-electron and electron-plasmon contributions to the nonequilibrium
electron distribution function, and the isotropic component of the current from the electrons scattered at the surface. It
is shown that the fine structure of the secondary electron emission spectrum and the total current spectrum is mainly attributable
to the electron structure of the final states into which the electrons enter or from which they are emitted so that the characteristics
of the band configuration in the energy band structure can be reconstructed directly from the experimental data. This method
can be used to separate bulk effects from surface effects in the secondary electron emission and total current spectra. It
is confirmed that the fine structure of the secondary electron emission and total current spectra depends on the geometric
structure and the degree of ordering of the crystals. A reduction in the intensity of the fine structure serves as a measure
of the defect structure in the surface region of the sample which can be successfully used to monitor the surface state during
treatment.
Zh. Tekh. Fiz. 69, 94–96 (June 1999) |
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