SiLcore edge fine structure in an oxidation series of silicon compounds: A comparison of microelectron energy loss spectra with theory
作者:
W. M. Skiff,
R. W. Carpenter,
S. H. Lin,
期刊:
Journal of Applied Physics
(AIP Available online 1985)
卷期:
Volume 58,
issue 9
页码: 3463-3469
ISSN:0021-8979
年代: 1985
DOI:10.1063/1.335768
出版商: AIP
数据来源: AIP
摘要:
Transmission electron energy loss spectra were obtained from small (approximately 100‐A˚ diam) regions of a series of single‐phase silicon‐containing specimens at 100‐keV incident beam energy, using a field emission source transmission electron microscope fitted with a magnetic sector spectrometer. The specimen foils were diamond cubic silicon, &agr;‐silicon carbide, &agr;‐silicon nitride, and amorphous silica. The SiLnear‐edge structure depends markedly upon the chemical environment of the silicon. In this paper we show that the changes in near‐L‐edge structure, including threshold onset energy shift and edge profile, result from bond‐induced changes in the valence shell electronic structure of the specimen materials. Extended Hu¨ckel molecular orbital theory was used to calculate the valence shell electronic structure of five‐atom tetrahedral clusters, with silicon as the central atom and the other atoms noted above in corner positions. Inelastic electron scattering cross sections for silicon 2pand 2score shell transitions to valence shell excited states were then calculated using the first Born approximation.
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