Structure of Epitaxial Layers of KCl on Ag(100)

Growth of coronene on (100)- and (111)-surfaces of fcc-crystals

“…The LEED pattern of KCl/Ag(100), explainable by a ((1.53 ± 0.01) × (1.53 ± 0.01)) superstructure, is shown in Fig. 2(a) and matches the results of Müller et al who measured the same incommensurate epitaxial relation from 1 to 10 ML of KCl [15].…”

“…Coronene and KCl were evaporated from quartz glass and boron nitride effusion cells, respectively. During the deposition of KCl the sample temperature was held at T = 425 K as suggested by Müller et al [15] and Guo et al [16], while KCl was evaporated at a source temperature of about 750 K. Due to the increased sample temperature the Ag(100) surface is homogeneously covered with KCl and only a minor fraction remains uncovered. The film quality was checked by room temperature STM measurements that are shown in the supplementary material Fig.…”

“…This might be caused by the weaker moleculesubstrate interaction compared to the adsorption on the bare silver surface. In comparison, 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) adsorbs in flat-lying geometry on KCl mainly for two reasons: (i) the intermolecular interactions of PTCDA exhibiting an electrostatic quadrupole moment are effectively attractive, leading to the preferential formation of islands with flat-lying molecules, and (ii) the attractive Coulomb interaction of the electronegative anhydride groups with the K + ions in the commensurate PTCDA/KCl epitaxial registry [15,29]. Both of these circumstances are not fulfilled for coronene.…”

“…(a) LEED of KCl/Ag(100) at 300 K and E = 104.3 eV, with a simulated pattern corresponding to a (1.53 × 1.53) superstructure[15]. (b) LEED of coronene on KCl/Ag(100) at ca.…”

Growth of NaCl on thin epitaxial KCl films on Ag(100) studied by SPA-LEED

“…We were motivated by the fact that KCl on Ag(100) forms highly ordered films with (100) orientation which are very well aligned to the Ag(100) substrate [9]. Differently, NaCl on Ag(100) leads to films composed of significantly smaller domains which, in addition, show rotational mosaicity [3,4,10].…”