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55. 


The puzzle of contrast inversion in DNA STM imaging (issue cover)



E. Shapir, J. Yi, H. Cohen, A. Kotlyar, and G. Cuniberti, and D. Porath

The Journal of Physical Chemistry B (letter section) 109, 14270 (2005)

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.



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online .pdf paper (for personal use only)online .pdf paper (for personal use only)
doi absolute link10.1021/jp052738e
online abstract at the publisher site
publisher site (ISSN:1520-6106)
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IF(2005): 4.033


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