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Narrow UV photoemission lines from graphite

Thiagarajan, Balasubramanian LU ; Kihlgren, T; Wallden, L and Yakimova, R (2002) Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21) In 7th International Conference on Nanometer-Scale Science andTechnology and 21st European Conference on Surface Science
Abstract
Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level,... (More)
Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level, which for graphite means states at the zone corners. Both lines should be useful for ador absorption studies as an alternative to the C 1s core line and the σ line may provide testing ground for the current modeling of excitation lifetimes in graphite. (Less)
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publication status
published
subject
keywords
narrow emission lines, graphite states, natural single crystal, photoemission spectra, STM, UPS, heating SiC crystals, ordered graphite overlayers, LEED, UV photoemission lines, graphite, Fermi level, zone corners, absorption, adsorption, excitation lifetimes, C
in
7th International Conference on Nanometer-Scale Science andTechnology and 21st European Conference on Surface Science
pages
2 pages
publisher
Lund University
conference name
Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21)
language
English
LU publication?
yes
id
5122023f-5fad-48f6-b17d-2afe233ff60b (old id 611042)
date added to LUP
2007-11-23 15:11:40
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2016-04-16 09:31:07
@misc{5122023f-5fad-48f6-b17d-2afe233ff60b,
  abstract     = {Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level, which for graphite means states at the zone corners. Both lines should be useful for ador absorption studies as an alternative to the C 1s core line and the σ line may provide testing ground for the current modeling of excitation lifetimes in graphite.},
  author       = {Thiagarajan, Balasubramanian and Kihlgren, T and Wallden, L and Yakimova, R},
  keyword      = {narrow emission lines,graphite states,natural single crystal,photoemission spectra,STM,UPS,heating SiC crystals,ordered graphite overlayers,LEED,UV photoemission lines,graphite,Fermi level,zone corners,absorption,adsorption,excitation lifetimes,C},
  language     = {eng},
  pages        = {2},
  publisher    = {ARRAY(0x863d7d8)},
  series       = {7th International Conference on Nanometer-Scale Science andTechnology and 21st European Conference on Surface Science},
  title        = {Narrow UV photoemission lines from graphite},
  year         = {2002},
}