ADSORPTION OFBr2ON Na-INTERCALATED LAYERED COMPOUNDS: BROMINE-INDUCED DEINTERCALATION

C. A. Papageorgopoulos, M. Kamaratos, D. C. Papageorgopoulos, W. Jaegermann, C. Pettenkofer and O. Henrion
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C. A. Papageorgopoulos: Department of Physics, University of Ioannina, PO Box 1186, GR–451 1 0 Ioannina, Greece
M. Kamaratos: Department of Physics, University of Ioannina, PO Box 1186, GR–451 1 0 Ioannina, Greece
D. C. Papageorgopoulos: Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
W. Jaegermann: Hahn-Meitner Institut, Glienicker Strasse 100, D-100 Berlin 39, Germany
C. Pettenkofer: Hahn-Meitner Institut, Glienicker Strasse 100, D-100 Berlin 39, Germany
O. Henrion: Hahn-Meitner Institut, Glienicker Strasse 100, D-100 Berlin 39, Germany

Surface Review and Letters (SRL), 1997, vol. 04, issue 02, 237-244

Abstract: This work refers to a study of the behavior ofBr2adsorbed on Na-intercalated1T-TaSe2(0001)andTiSe2(0001)surfaces at 100 K and during subsequent warming up to 300 K. The investigation was performed in UHV with LEED and photoemission with synchrotron radiation measurements. At 100 K, the bromine forms molecular multilayers onNa/TaSe2. TheBr2layer, close to the substrate, interacts weakly with Na near the surface, forming${\rm NaBr}^{-}_{2}$. At 300 K, part of theBr2overlayer desorbs while the remainder on both1T-TaSe2andTise2surfaces interacts strongly with Na, leading to deintercalation of Na to the surface in the tendency to form NaBr. The formation of NaBr overlayers causes the transition of the incommensurate${\sqrt{13}} \times {\sqrt{13}}$surface structure of1T-TaSe2(0001)to1×1. ESD from theBr/Na/1T-TaSe2surface causes the restoration of the${\sqrt{13}}\times{\sqrt{13}}$.

Date: 1997
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DOI: 10.1142/S0218625X97000237

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