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Volumn 278, Issue 5336, 1997, Pages 257-260

Microscopic molecular diffusion enhanced by adsorbate interactions

Author keywords

[No Author keywords available]

Indexed keywords

CARBON MONOXIDE; COPPER;

EID: 0030764975     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.278.5336.257     Document Type: Article
Times cited : (138)

References (41)
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    • 0 is also weakly temperature dependent. Details can be found in (1).
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    • A further test for such STM-induced artifacts is to decrease the barrier resistance until individual CO molecules can be manipulated with the probe tip. We found that this happened typically at R < 2 Mohm. A repulsive tip-adsorbate interaction was observed, in accordance with other reports on molecular manipulation (24, 25). Because all images of a time-lapse series are scanned in the same direction, repulsive interactions deplete the sampled area by shuffling the adsorbates to the edges of the scan window. Such an effect was never observed for the tunneling conditions (R = 0.5 to 1 Gohm) used in the diffusion experiments.
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    • The fits take into account the fact that "looplike" hopping sequences that bring the adsorbates back to their original sites can be overlooked in the experiment because of the finite time delay between sequential images. This effect, which increases the fraction of adsorbates that apparently have not moved, is much more important for chain hopping than for monomer hopping.
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    • We acknowledge helpful discussions with H. Conrad and R. Liebenow.


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