Evolution of a Two-Dimensional Band Structure at a Self-Assembling Interface

Two-photon photoemission is used to investigate the interfacial band structure of the methanethiolate/Ag(111) interface. Two adsorbate-induced electronic states are observed:  one occupied, the other an unoccupied excited state. The initially occupied and unoccupied electronic states have effective...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2002-08, Vol.106 (33), p.7636-7638
Main Authors: Miller, A. D, Gaffney, K. J, Liu, S. H, Szymanski, P, Garrett-Roe, S, Wong, C. M, Harris, C. B
Format: Article
Language:English
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Summary:Two-photon photoemission is used to investigate the interfacial band structure of the methanethiolate/Ag(111) interface. Two adsorbate-induced electronic states are observed:  one occupied, the other an unoccupied excited state. The initially occupied and unoccupied electronic states have effective masses of −2m e and 0.5m e, respectively. At a low coverage of thiolate molecules, the unoccupied state is measured to be nondispersive. At intermediate coverages both nondispersive and dispersive unoccupied electronic states are observed. This coverage dependent evolution can be interpreted as a phase transition from a less dense to a more dense layer configuration.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp025555q