Quantitative atom-resolved force gradient imaging using noncontact atomic force microscopy


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Oral A. , GRIMBLE R., ÖZER H. Ö. , HOFFMANN P., PETHICA J.

APPLIED PHYSICS LETTERS, cilt.79, sa.12, ss.1915-1917, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 79 Konu: 12
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1063/1.1389785
  • Dergi Adı: APPLIED PHYSICS LETTERS
  • Sayfa Sayıları: ss.1915-1917

Özet

Quantitative force gradient images are obtained using a sub-angstrom amplitude, off-resonance lever oscillation method during scanning tunneling microscopy imaging. We report the direct observation of short-range bonds, and the measured short-range force interaction agrees well in magnitude and length scale with theoretical predictions for single bonds. Atomic resolution is shown to be associated with the presence of a prominent short-range contribution to the total force interaction. It is shown that the background longer-range interaction, whose relative magnitude depends on the tip structure, has a significant effect on the contrast observed at the atomic scale. (C) 2001 American Institute of Physics.