Isolation of an intrinsic precursor to molecular chemisorption

Science

Volumn 279, Issue 5350, 1998, Pages 542-544

  Brown, David E ^a   Moffatt, Douglas J ^a   Wolkow, Robert A ^a  

^a NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

BENZENE; SILICON;

ADSORPTION; ARTICLE; CHEMICAL BOND; ENERGY RESOURCE; PRIORITY JOURNAL; SPECIES DIFFERENTIATION;

EID: 0032559216     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.279.5350.542     Document Type: Article

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39. -8 torr benzene pressure. When the gas leak valve was closed, vacuum pumps very quickly removed residual gaseous molecules. Therefore, virtually no adsorption events occurred during image acquisition.
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41. Two mechanisms can lead to the appearance of physisorbed molecules in STM images. The first, a physical mechanism, acts when nonresonant states cause a lowering of the local barrier and hence an increased transmission coefficient [J. W. Gadzuk, J. Appl. Phys. 41, 286 (1970)]. The second, a chemical mechanism, involves mixing and broadening of surface and molecule-derived states. Related effects have been seen in STM images of Xe on Ni [D. M. Eigler, P. S. Weiss, E. K. Schweizer, N. D. Lang, Phys. Rev. Lett. 66, 1189 (1991)].
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46. Precursor decay was observed to occur at the same rate whether an area was scanned repeatedly or infrequently. This indicates that the act of scanning plays no important role in the decay to chemisorption.
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49. We thank G. P. Lopinski, S. N. Patitsas, D. D. M. Wayner, and J. C. Tully for helpful discussions. This is NRCC document 40839.