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DPG

Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.26: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

LEED I(V) analysis of CO and N2 physisorption on the NaCl(100) surface — •Jochen Vogt and Helmut Weiss — Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

Carbon monoxide and N2 physisorbed on the NaCl(100) surface have been considered in the past as model systems for orientational order-disorder phase transitions in two dimensions [1,2]. Although CO and N2 are isoelectronic, the lateral intermolecular potential of adsorbed CO is governed by dipole-dipole interaction, while in the case of N2 quadrupole-quadrupole interaction is the leading electrostatic term. Low-energy electron diffraction experiments (LEED) prove, that upon cooling below 35 K the lattice symmetry in the system CO/NaCl(100) changes from a (1×1) to a (2×1). However, few is known about the adsorbate structure from an experimental point of view. We report a LEED I(V) structure analysis of CO/NaCl(100) and N2/NaCl(100), guided by density functional theory (DFT-D/PBE) calculations. Although predicted by theory [2], our experiments do not support a disorder/order phase transition (1×1)→(2×1) for N2/NaCl(100) above 18 K.
W. Rzysko, A. Patrykiejew, K. Binder, Phys. Rev. B 76 (2007), 195409
A. K. Sallabi, D. Jack, Phys. Rev. B 62 (2000), 4841

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