TESTING THE CHARGED ADATOM MODEL ONTO THE${\rm Sn}_{1-x}{\rm Si}_x/{\rm Si}(111) (\sqrt{3}\times \sqrt{3}){\rm R}30^\circ$ALLOY WITH HIGH RESOLUTION CORE LEVEL SPECTROSCOPY

L. Ottaviano, G. Profeta, S. Santucci, L. Petaccia and M. Pedio
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L. Ottaviano: Unità INFM and Dipartimento di Fisica Università degli Studi dell'Aquila, Via Vetoio 10, I-67010 Coppito–L'Aquila, Italy
G. Profeta: Unità INFM and Dipartimento di Fisica Università degli Studi dell'Aquila, Via Vetoio 10, I-67010 Coppito–L'Aquila, Italy
S. Santucci: Unità INFM and Dipartimento di Fisica Università degli Studi dell'Aquila, Via Vetoio 10, I-67010 Coppito–L'Aquila, Italy
L. Petaccia: Laboratorio TASC-INFM, Area Science Park–Basovizza S.S.147 Km 163.5, I-34012 Trieste, Italy
M. Pedio: ISM-CNR, Area Science Park–Basovizza S.S.14 Km 163.5, I-34012 Trieste, Italy

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 675-679

Abstract: Synchrotron radiation high resolution core level spectroscopy has been used to investigate the 1/3 monolayer (ML)${\rm Sn}_{1-x}{\rm Si}_x/{\rm Si}(111) (\sqrt{3}\times \sqrt{3}){\rm R}30^\circ$solid solution at well-defined values of the mutual surface concentration of the Sn and Si adatoms (x = 0.24andx = 0.40) as a function of temperature (100–300 K). For 24% Si adatoms at the surface there is low energy electron diffraction (LEED) evidence of a nascent 3 × 3 lowering of the surface symmetry at 100 K. Despite this evidence core level spectroscopy data do not show any signature of the nascent phase transition. Our evidence is in agreement with the analogous observation of no significant spectral changes at reduced temperature of the core level spectra of the isoelectronic and isostructural 1/3 ML Sn/Ge(111) surface.

Date: 2002
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DOI: 10.1142/S0218625X02002889

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