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Electrostatic forces on a CO molecule: Simulating an AFM image
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

    In atomic force microscopy (AFM), the measured force between tip and substrate is used to produce images with subatomic resolution. In this thesis, plausible electrostatic interactions between tip-substrate is studied and compared with the experimental results in the report Vibrations of a molecule in an external force field by Okabayashi et al.. A simplified model gives by hand that the interaction between substrate and tip is dominated by a point charge - point charge relation due to the interatomic distances in AFM. We find that the electrostatic interaction can reproduce the experiment down to a limit of z ~ 3 Å. Further, we find that the tip interacts with the sample as a point charge with an induced dipole moment obtained by the electric field of the substrate. By analyzing electrostatic forces and compare them with the results in the Okabayashi et al. report, the AFM images in the report could be reproduced.

Place, publisher, year, edition, pages
2018. , p. 33
Keywords [en]
AFM, electrostatic, electrostatic forces, CO molecule, dipole potential
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-75756OAI: oai:DiVA.org:lnu-75756DiVA, id: diva2:1217702
Subject / course
Physics
Educational program
Physics Programme, 180 credits
Presentation
2018-06-08, D0043, Hus D, Vejdes plats 7, Växjö, 12:38 (Swedish)
Supervisors
Examiners
Note

Rättande lärare: Cecilia Holmqvist

Available from: 2018-06-14 Created: 2018-06-13 Last updated: 2018-08-16Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf