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