caa a22 4500 475844009 CHVBK 20180406123908.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1009050831597 doi (NATIONALLICENCE)springer-10.1023/A:1009050831597 Imaging and chemical probing on the atomic scale: reconstruction and dynamics of the systems O2/Rh and NO2-H2/Pt [Elektronische Daten] [T. Visart de Bocarmé, N. Kruse] This paper presents two case studies of adsorbate-induced surface reconstruction, on the one hand, and dynamical reaction imaging along with local chemical probing, on the other hand. The first one deals with the oxygen-induced reshaping of 3D Rh crystals. Field ion microscopy (FIM) was applied to image in real-space the change from a nearly hemispherical shape in the absence of oxygen toward a polyhedral one in the presence of oxygen. Shape transformation occurs at temperatures of 380-550 K and is associated with the appearance of facets with {111} and {001} orientation. The only high-index planes present in the polyhedral form are of {137} symmetry. (1×2) and (1×3) missing-row reconstructions appear in the {113} and {011} planes. The polyhedral form has also been imaged under in situ conditions of the oxygen-hydrogen reaction on Rh at 505 K. The second case study deals with kinetic non-linearities occurring in the NO2 reaction with hydrogen on the surface of a 3D Pt crystal reconstructed to a top- and edge-truncated pyramid. The reaction was found to ignite in the {012} corner planes of the crystal. One-dimensional wavefronts were subsequently observed to move along the 〈211〉 zone lines. These studies were performed by video-FIM and could be correlated with a local chemical analysis by time-of-flight mass spectrometry of ionised species. The mass spectrum provided information on water product (H2O+ and H3O+) and NO intermediate formation. Strong fluctuations in the NO 2 + current indicated the occurrence of NO2 surface diffusion. These species are most likely responsible for the field ion image formation. Plenum Publishing Corporation, 2000 atom-probe field ion microscopy nationallicence hydrogen nationallicence oxygen nationallicence nitrogen dioxide nationallicence rhodium nationallicence platinum nationallicence Visart de Bocarmé T. Chimie Physique des Matériaux, Campus Plaine, Université Libre de Bruxelles, CP243, B-1050, Bruxelles, Belgium aut Kruse N. Chimie Physique des Matériaux, Campus Plaine, Université Libre de Bruxelles, CP243, B-1050, Bruxelles, Belgium aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 14/1-4(2000-12-01), 35-42 1022-5528 14:1-4<35 2000 14 11244 https://doi.org/10.1023/A:1009050831597 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009050831597 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Visart de Bocarmé T. Chimie Physique des Matériaux, Campus Plaine, Université Libre de Bruxelles, CP243, B-1050, Bruxelles, Belgium aut NATIONALLICENCE 700 1- Kruse N. Chimie Physique des Matériaux, Campus Plaine, Université Libre de Bruxelles, CP243, B-1050, Bruxelles, Belgium aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 14/1-4(2000-12-01), 35-42 1022-5528 14:1-4<35 2000 14 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer