1.8 MeV electron bombardment induced structural changes on graphite surfaces observed by scanning tunnelling microscopy
Refereed conference paper presented and published in conference proceedings


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AbstractHighly oriented pyrolitic graphite (HOPG) was irradiated with 1.8 MeV electrons at 45 degrees and near grazing (86 degrees) angles of incidence. For doses up to 10(16) cm(-2) the surface for the case of 45 degrees 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 5x10(12) cm(-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 5x10(14) cm(-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-libe pattern suggests that the corrugations are electronic as well as topographic in origin. We 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 bull;structure layers.
All Author(s) ListChen YJ, Wilson IH, Libin L, Xu JB
Name of ConferenceSymposium B on Microstructure Evolution During Irradiation, at the 1996 MRS Fall Meeting
Start Date of Conference02/12/1996
End Date of Conference05/12/1996
Place of ConferenceBOSTON
Country/Region of ConferenceUnited States of America
Year1997
Month1
Day1
Volume Number439
PublisherMATERIALS RESEARCH SOCIETY
Pages703 - 708
ISBN1-55899-343-6
ISSN0272-9172
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesMaterials Science; Materials Science, Multidisciplinary

Last updated on 2020-12-01 at 01:52