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Phys Rev Lett. 2008 Jan 18;100(2):026103. Epub 2008 Jan 15.

Structural origin of the Sn 4d core level line shape in Sn/Ge(111)-(3x3).

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  • 1Matériaux et Phénomènes Quantiques, CNRS, Université Paris Diderot, 75205 Paris, France.


High-resolution photoemission of the Sn 4d core level of Sn/Ge(111)-(3x3) resolves three main components in the line shape, which are assigned to each of the three Sn atoms that form the unit cell. The line shape found is in agreement with an initial state picture and supports that the two down atoms are inequivalent. In full agreement with these results, scanning tunnel microscopy images directly show that the two down atoms are at slightly different heights in most of the surface, giving rise to an inequivalent-down-atoms (3x3) structure. These results solve a long-standing controversy on the interpretation of the Sn 4d core-level line shape and the structure of Sn/Ge(111)-(3x3).

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