Ultrahigh-vacuum scanning force microscopy : atomic-scale resolution at monatomic cleavage steps

Howald, L. and Haefke, H. and Luthi, R. and Meyer, E. and Gerth, G. and Rudin, H. and Guntherodt, H. J.. (1994) Ultrahigh-vacuum scanning force microscopy : atomic-scale resolution at monatomic cleavage steps. Physical Review B, Vol. 49, H. 8. pp. 5651-5656.

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Official URL: http://edoc.unibas.ch/dok/A5839497

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The surfaces of in situ cleaved NaF crystals have been studied by scanning force microscopy (SFM) in ultrahigh vacuum (UHV). Operating the UHV force microscope in the contact mode, the surface structure with extended terraces interrupted by steps of typically 0.25 nm and 0.5 nm in height is revealed. Atomic-scale resolution is achieved on the terraces as well as at monatomic steps of the ionic crystal. The square surface lattice shows a periodicity of 0.45+/-0.04 nm that corresponds well to the spacing between equally charged ions along the [100] directions in the bulk phase. From the SFM data at cleavage steps the imaging area of the sensing tip is estimated to be less than 1 nm2. Some aspects of the contrast mechanism in the lateral and normal force images are discussed. The SFM data are complemented by low-energy-electron-diffraction measurements on NaF(001) carried out in the same compact UHV system.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:42

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