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The Soft X‐Ray Appearance Potential Spectra of Diamond and Graphite
Author(s) -
Lee A. E.,
Webster J.
Publication year - 1976
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220760227
Subject(s) - diamond , graphite , tungsten , spectral line , materials science , diamond type , material properties of diamond , thermionic emission , carbon fibers , graphene , atomic physics , analytical chemistry (journal) , molecular physics , electron , chemistry , nanotechnology , physics , metallurgy , composite material , composite number , quantum mechanics , astronomy , chromatography
Abstract The soft X‐ray appearance potential spectroscopic technique has been applied to diamond and graphite. The spectrum obtained from diamond is found to be similar to those obtained from other forms of carbon but to contain important differences. From the differences it is inferred that a graphitic over layer is not present. The similarities in the spectra of diamond and graphite suggest that the multiplicity of peaks observed in spectra from carbon is not due to plasmon effects. Agreement between the observed diamond spectrum and that obtained from a density of electron states model is only possible if an empty surface state band is postulated existing between the valence and lower conduction bands. The spectra of both diamond and graphite are effected by the evaporation of tungsten from the thermionic cathode. The contamination is particularly difficult to observe as the technique is shown to be relatively insensitive to evaporated tungsten films.