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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Poster Wednesday: Surface Structure, Epitaxy and Growth

O 65.9: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

N2 physisorption on the KCl(100) surface — •Jochen Vogt — Chemisches Institut der Uni Magdeburg, Magdeburg, Germany

Molecular nitrogen is known to only weakly interact with ionic materials like NaCl and KCl [1,2]. Experimental information on the adsorbate structures is sparse so far [1]. This contribution compares results from quantitative low-energy electron diffraction (LEED) experiments for these systems. While in the case of N2/NaCl(100) a p(1×1) symmetry is observed even at the lowest accessible temperature of 20 K, lattice mismatch induced strain causes a different behavior in the N2/KCl(100) system. Here, the p(1×1) phase transforms into an oblique 2D phase of higher density at elevated N2 partial pressure and temperatures below 40 K. For the p(1×1) phase, LEED I(V) analysis supports an adsorption site of N2 on top of Na+ on the NaCl substrate [1], while on the KCl(100) surface the N2 molecules appear laterally displaced on the line connecting neighboring cations. This is interpreted in terms of strain-induced structural disorder that causes local coalescence of neighboring molecules. [1] J. Vogt, J. Chem. Phys. 137 (2012), 174705 [2] J. Vogt, H. Weiss, Z. Phys. Chem. 218 (2004), 973

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