Shapir, Errez and Yi, J. Y. and Cohen, H. and Kotlyar, A. B. and Cuniberti, Gianaurelio and Porath, D. (2005) The puzzle of contrast inversion in DNA STM imaging. JOURNAL OF PHYSICAL CHEMISTRY B, 109 (30). pp. 14270-14274. ISSN 1520-6106,
Full text not available from this repository. (Request a copy)Abstract
DNA has been at the center of an imaging effort since the invention of the scanning tunneling microscope (STM). In some of the STM imaging reports the molecules appeared with negative contrast, i.e., "submerged" under the metal background and darker. We demonstrate the phenomenon of contrast inversion in DNA STM imaging by controlled and spontaneous contrast inversions and by the dependence of the DNA apparent height with respect to the surface on the imaging bias voltage. Using these characterizations, we formulate a model explaining the above phenomenon by resonant tunneling through virtual states in the vacuum between the STM tip and the DNA molecule.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SCANNING-TUNNELING-MICROSCOPY; CU(111) SURFACES; STRANDED-DNA; MOLECULES; IMMOBILIZATION; n |
| Subjects: | 500 Science > 530 Physics 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Physics > Institute of Theroretical Physics > Alumni or Retired Professors > Group Gianaurelio Cuniberti |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 May 2021 09:49 |
| Last Modified: | 03 May 2021 09:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/35779 |
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