Laser desorption from and reconstruction on Si(100) surfaces studied by scanning tunneling microscopy

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Laser irradiated Si(100) surfaces were studied with an ultrahigh-vacuum scanning tunneling microscopy (STM) system. Our observations indicate that only the dimerized outermost atomic layer is removed if the laser fluence is below the melting threshold with a photon energy larger than the band gap. The newly exposed layer, surprisingly, did not have a dimerized atomic structure, but rather, resembled that of a bulk-terminated structure. The uncovered layer remained atomically smooth (no vacancies) even after 90% of the outermost layer was removed. A possible explanation of these observations is that atom removal occurs by a preferential breakage of the atomic bonds ... continued below

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24 p.

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Xu, Jun; Overbury, S.H. & Wendelken, J.F. July 1, 1995.

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Laser irradiated Si(100) surfaces were studied with an ultrahigh-vacuum scanning tunneling microscopy (STM) system. Our observations indicate that only the dimerized outermost atomic layer is removed if the laser fluence is below the melting threshold with a photon energy larger than the band gap. The newly exposed layer, surprisingly, did not have a dimerized atomic structure, but rather, resembled that of a bulk-terminated structure. The uncovered layer remained atomically smooth (no vacancies) even after 90% of the outermost layer was removed. A possible explanation of these observations is that atom removal occurs by a preferential breakage of the atomic bonds in defect sites. When the laser fluence was increased to levels above the melting threshold, extensive surface roughening occurs.

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24 p.

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OSTI as DE96005457

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  • Scanning tunneling microscopy (STM) conference, Snowmass, CO (United States), 24-28 Jul 1995

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  • Other: DE96005457
  • Report No.: CONF-9507225--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 198735
  • Archival Resource Key: ark:/67531/metadc667171

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  • July 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 7:30 p.m.

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Xu, Jun; Overbury, S.H. & Wendelken, J.F. Laser desorption from and reconstruction on Si(100) surfaces studied by scanning tunneling microscopy, article, July 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc667171/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.