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Publications in Scientific Journals:

M. Horák, M. Stöger-Pollach:
"The Čerenkov limit of Si, GaAs and GaP in electron energy loss spectrometry";
Ultramicroscopy, 157 (2015), 73 - 78.



English abstract:
Since the advent of monochromated electron energy loss spectrometry (EELS) the experimental detection of band gaps in semiconducting materials is of great importance. In the non-relativistic limit of this technique the onset of the inelastic signal represents the band gap. But due to relativistic energy losses, like Čerenkov losses and the corresponding light guiding modes, appearing at high beam energies the band gap is usually hidden. The highest beam energy, which does not excite relativistic losses in a certain material, is called the Čerenkov limit of the material. In this work the low loss EELS signals of Si, GaAs and GaP are measured at various beam energies and the calculated Čerenkov limits are experimentally confirmed.

Keywords:
Low voltage EELS; Band gap; Čerenkov radiation


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1016/j.ultramic.2015.06.005

Electronic version of the publication:
http://www.sciencedirect.com/science/article/pii/S0304399115001394


Created from the Publication Database of the Vienna University of Technology.