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1.8 MeV electron bombardment induced structural changes on graphite surfaces observed by scanning tunnelling microscopy

Chen, Y.J. ; Wilson, I.H. ; Xu, J.B. ; Libin, L.

United States: Materials Research Society, Pittsburgh, PA (United States) 1997

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  • Title:
    1.8 MeV electron bombardment induced structural changes on graphite surfaces observed by scanning tunnelling microscopy
  • Author: Chen, Y.J. ; Wilson, I.H. ; Xu, J.B. ; Libin, L.
  • Subjects: CRYSTAL STRUCTURE ; EXPERIMENTAL DATA ; GRAPHITE ; MATERIALS SCIENCE ; MICROSTRUCTURE ; PHYSICAL RADIATION EFFECTS ; PYROLYTIC CARBON
  • Notes: CONF-961202-
  • Description: Highly oriented pyrolitic graphite (HOPG) was irradiated with 1.8 MeV electrons at 45{degree} and near grazing (86{degree}) angles of incidence. For doses up to 10{sup 16} cm{sup {minus}2} the surface for the case of 45{degree} incidence, observed by scanning tunnelling microscopy (STM) remained the same as the original sample showing only the usual periodic atomic corrugation. For near grazing incidence, at a dose of 5 {times} 10{sup 12} cm{sup {minus}2}, nm-hillocks are observed, some elongated along the direction of the beam incidence. These are attributed to the effects of single electron-carbon interactions in the top surface layers. At a dose of 5 {times} 10{sup 14} cm{sup {minus}2} (near grazing incidence) STM observations show an anomalously large (period 2.5 to 17 nm) superperiodicity superimposed on the normal 0.246 nm atomic spacing of graphite. This Moire-like pattern suggests that the corrugations are electronic as well as topographic in origin. The authors propose that near grazing incidence electron irradiation causes a break-up of the surface layers into fragments, largely retaining the six-fold atomic rings, that rotate by a small angle resulting in the observed pattern by interaction with the deeper bulk-structure layers.
  • Publisher: United States: Materials Research Society, Pittsburgh, PA (United States)
  • Creation Date: 1997
  • Language: English
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