Diffusion-limited island decay of PTCDA on Ag(100): Determination of the intermolecular interaction

Julian Ikonomov; Christoph H. Schmitz; Moritz Sokolowski

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Diffusion-limited island decay of PTCDA on Ag(100): Determination of the intermolecular interaction

机译：PTCDA在Ag（100）上的扩散限制的岛衰减：分子间相互作用的测定

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The coarsening of two-dimensional islands of the model molecule perylene-3,4,9,10-tetracarboxylic acid dianhydride adsorbed on the Ag(100) surface was investigated by scanning tunneling microscopy. The islands have a quadratic equilibrium shape with rounded corners. The decay curves (island area versus time) can be understood by the classical continuum model according to the Ostwald theory. In the limit of well-separated islands, the asymptotic power law (t~α) exhibits an exponent α=0.61 ± 0.05. This reveals that the coarsening is diffusion limited and that no interfacial barrier exists between island edge sites and terrace sites. From numerical simulations on an ensemble of islands, using the mean-field approach, we determine the average line tension of the island edge at 51 ± 5 meV per molecule. Here from we deduce a next-neighbor intermolecular interaction of 102 ± 10 meV.

机译：通过扫描隧道显微镜研究了吸附在Ag（100）表面的模型分子molecule-3,4,9,10-四羧酸二酐的二维岛的粗化。这些岛具有带圆角的二次平衡形状。根据奥斯特瓦尔德（Ostwald）理论，经典连续谱模型可以理解衰减曲线（岛屿面积与时间的关系）。在岛分离的极限内，渐近幂律（t〜α）的指数为α= 0.61±0.05。这表明，粗糙化是受扩散限制的，并且在岛边缘部位和阶地之间不存在界面障碍。通过使用均值场方法对一组岛进行数值模拟，我们确定岛边缘的平均线张力为每分子51±5 meV。从这里我们推断出102±10 meV的下一个分子间相互作用。

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来源
《Physical review》 |2010年第19期|P.195428.1-195428.7|共7页
作者
Julian Ikonomov; Christoph H. Schmitz; Moritz Sokolowski;
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Institute for Theoretical and Physical Chemistry, University of Bonn, Wegelerstr. 12, 53115 Bonn, Germany;

Institute for Theoretical and Physical Chemistry, University of Bonn, Wegelerstr. 12, 53115 Bonn, Germany;

Institute for Theoretical and Physical Chemistry, University of Bonn, Wegelerstr. 12, 53115 Bonn, Germany;

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diffusion of adsorbates, kinetics of coarsening and aggregation; scanning tunneling microscopy (including chemistry induced with STM); intermolecular and atom-molecule potentials and forces;

机译：吸附物的扩散;粗化和聚集的动力学;扫描隧道显微镜（包括用STM诱导的化学反应）;分子间和原子分子的势和力;

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Diffusion-limited island decay of PTCDA on Ag(100): Determination of the intermolecular interaction

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