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EFFECTS OF THE STM TIP ON ADSORBATE IMAGE

RAMOS, MMD; SUTTON, AP; STONEHAM, AM; (1991) EFFECTS OF THE STM TIP ON ADSORBATE IMAGE. In: JOURNAL OF PHYSICS-CONDENSED MATTER. (pp. S127 - S131). IOP PUBLISHING LTD Green open access

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Abstract

Scanning tunnelling microscopy provides atomic scale information about surface topography and electronic structure. However, the way the tip affects the STM image cannot always be neglected. We present a theoretical study of the effect of the non-uniform electric field of the tip on STM image of adsorbed molecules using Bardeen's approach. Self-consistent geometry optimization and wave-function calculations have been carried out within the CNDO approximation in a cluster model. Our results indicate significant effects. Thus for adsorbed CO on metal, the molecules reorient because of the tip, and the image is changed qualitatively as well as quantitatively. This may explain the lack of observation of CO at low coverage by STM. Our results also suggest the STM might be used for molecular modification.

Type:Proceedings paper
Title:EFFECTS OF THE STM TIP ON ADSORBATE IMAGE
Event:9TH INTERDISCIPLINARY SURFACE SCIENCE CONF ( ISSC-9 )
Location:SOUTHAMPTON, ENGLAND
Dates:1991-04-22 - 1991-04-24
Open access status:An open access version is available from UCL Discovery
DOI:10.1088/0953-8984/3/S/021
Publisher version:http://dx.doi.org/10.1088/0953-8984/3/S/021
Language:English
Additional information:Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
Keywords:TUNNELLING MICROSCOPE, MOLECULES
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology

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