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Large take-off angle dependence of C-K emission spectra observed in highly oriented pyrolytic graphite

Niibe, Masahito; Tokushima, Takashi LU ; Takehira, Noritaka and Araki, Yuma (2017) In Journal of Electron Spectroscopy and Related Phenomena 220. p.118-120
Abstract

We have constructed a compact soft X-ray emission spectrometer at the BL-09A beamline of the NewSUBARU synchrotron radiation facility at the University of Hyogo, Japan. Using this spectrometer, we observed a large take-off angle dependence of C-K emissions in highly oriented pyrolytic graphite (HOPG). At an excitation photon energy of 310 eV, far from the absorption edge of HOPG, we detected large take-off angle dependence of π → 1s emission. The π emission intensity was much higher than that of σ emission, which has not been reported before. One reason for the apparent discrepancy between these results and previous ones probably originates from the difference in energy resolving power of the emission spectrometers used. According to a... (More)

We have constructed a compact soft X-ray emission spectrometer at the BL-09A beamline of the NewSUBARU synchrotron radiation facility at the University of Hyogo, Japan. Using this spectrometer, we observed a large take-off angle dependence of C-K emissions in highly oriented pyrolytic graphite (HOPG). At an excitation photon energy of 310 eV, far from the absorption edge of HOPG, we detected large take-off angle dependence of π → 1s emission. The π emission intensity was much higher than that of σ emission, which has not been reported before. One reason for the apparent discrepancy between these results and previous ones probably originates from the difference in energy resolving power of the emission spectrometers used. According to a band calculation for HOPG, the large angle dependence observed here could be attributed to the resonant transition of 1s electrons to a π state 25 eV higher than the Fermi level.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
C-K emission, Highly oriented pyrolytic graphite, Soft X-ray emission spectroscopy, Take-off angle, XES
in
Journal of Electron Spectroscopy and Related Phenomena
volume
220
pages
3 pages
publisher
Elsevier
external identifiers
  • scopus:85013070483
ISSN
0368-2048
DOI
10.1016/j.elspec.2017.02.001
language
English
LU publication?
no
id
30a78b96-6bd0-49d0-956a-1aaaf469015e
date added to LUP
2019-06-04 17:55:58
date last changed
2019-08-14 04:39:15
@article{30a78b96-6bd0-49d0-956a-1aaaf469015e,
  abstract     = {<p>We have constructed a compact soft X-ray emission spectrometer at the BL-09A beamline of the NewSUBARU synchrotron radiation facility at the University of Hyogo, Japan. Using this spectrometer, we observed a large take-off angle dependence of C-K emissions in highly oriented pyrolytic graphite (HOPG). At an excitation photon energy of 310 eV, far from the absorption edge of HOPG, we detected large take-off angle dependence of π → 1s emission. The π emission intensity was much higher than that of σ emission, which has not been reported before. One reason for the apparent discrepancy between these results and previous ones probably originates from the difference in energy resolving power of the emission spectrometers used. According to a band calculation for HOPG, the large angle dependence observed here could be attributed to the resonant transition of 1s electrons to a π state 25 eV higher than the Fermi level.</p>},
  author       = {Niibe, Masahito and Tokushima, Takashi and Takehira, Noritaka and Araki, Yuma},
  issn         = {0368-2048},
  keyword      = {C-K emission,Highly oriented pyrolytic graphite,Soft X-ray emission spectroscopy,Take-off angle,XES},
  language     = {eng},
  month        = {10},
  pages        = {118--120},
  publisher    = {Elsevier},
  series       = {Journal of Electron Spectroscopy and Related Phenomena},
  title        = {Large take-off angle dependence of C-K emission spectra observed in highly oriented pyrolytic graphite},
  url          = {http://dx.doi.org/10.1016/j.elspec.2017.02.001},
  volume       = {220},
  year         = {2017},
}