CLEAN AND OXYGEN-COVERED Cu3Au(110): A SURFACE STRUCTURE INVESTIGATION WITH STM AND NICISS

1996 ◽  
Vol 03 (05n06) ◽  
pp. 1899-1908 ◽  
Author(s):  
HORST NIEHUS ◽  
THOMAS BAUMANN ◽  
MATTHIAS VOETZ ◽  
KARINA MORGENSTERN
Keyword(s):  
Surface Layer ◽  
Pure Copper ◽  
Copper Surface ◽  
Rapid Cool ◽  
Scanning Tunneling ◽  
Structure Model ◽  
Ion Scattering ◽  
Tunneling Microscopy ◽  
Careful Preparation ◽  
Low Energy Ion Scattering

Cu 3 Au (110) has been investigated by scanning tunneling microscopy (STM) and 180° low energy ion scattering and detection of neutrals (NICISS). Two different terminations would be possible on the basis of a bulk-truncated surface, a gold-rich or a pure copper surface layer. From the NICISS investigation the gold-rich termination has been found. Two surface modifications could be prepared. Rapid cool-down after annealing at 800 K results in a 2×1 LEED superstructure, but careful preparation and prolonged cooling below 600 K gives a LEED 4×1 superstructure. A new pairing row model has been proposed. Upon oxygen exposure at 330 K on the quenched 2×1 surface and subsequent annealing at 800 K, a 2×1 LEED superstructure presents itself with considerably sharper half order reflexes. NICISS data propose a segregation of Cu atoms to the surface layer forming -Cu-O- rows just above the Cu rows in the Au -rich layer. The 2×1 superstructure formed is in part similar to the well-known added row structure at Cu (110)-(2×1)-O. The structure model has been verified by direct imaging of the added rows with STM.

scholarly journals Lateral ordering of PTCDA on the clean and the oxygen pre-covered Cu(100) surface investigated by scanning tunneling microscopy and low energy electron diffraction

2014 ◽  
Vol 10 ◽  
pp. 2055-2064 ◽  
Author(s):  
Stefan Gärtner ◽  
Benjamin Fiedler ◽  
Oliver Bauer ◽  
Antonela Marele ◽  
Moritz M Sokolowski
Keyword(s):  
Electron Diffraction ◽  
Scanning Tunneling Microscopy ◽  
Low Energy ◽  
Energy Electron ◽  
Scanning Tunneling ◽  
Structure Model ◽  
Tunneling Microscopy ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Lattice Planes

We have investigated the adsorption of perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA) on the clean and on the oxygen pre-covered Cu(100) surface [referred to as (√2 × 2√2)R45° – 2O/Cu(100)] by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). Our results confirm the (4√2 × 5√2)R45° superstructure of PTCDA/Cu(100) reported by A. Schmidt et al. [J. Phys. Chem. 1995, 99,11770–11779]. However, contrary to Schmidt et al., we have no indication for a dissociation of the PTCDA upon adsorption, and we propose a detailed structure model with two intact PTCDA molecules within the unit cell. Domains of high lateral order are obtained, if the deposition is performed at 400 K. For deposition at room temperature, a significant density of nucleation defects is found pointing to a strong interaction of PTCDA with Cu(100). Quite differently, after preadsorption of oxygen and formation of the (√2 × 2√2)R45° – 2O/Cu(100) superstructure on Cu(100), PTCDA forms an incommensurate monolayer with a structure that corresponds well to that of PTCDA bulk lattice planes.

The structure of a clean and oxygen covered copper surface studied by low energy ion scattering

1989 ◽  
Vol 214 (1-2) ◽  
pp. A252
Author(s):  
E. Van De Riet ◽  
J.B.J. Smeets ◽  
J.M. Fluit ◽  
A. Niehaus
Keyword(s):  
Copper Surface ◽  
Low Energy ◽  
Ion Scattering ◽  
Low Energy Ion Scattering

ULTRATHIN Al FILM ON THE W(100) SURFACE

2009 ◽  
Vol 23 (06) ◽  
pp. 835-847 ◽  
Author(s):  
D. S. CHOI ◽  
D. H. KIM
Keyword(s):  
Surface Layer ◽  
Annealing Temperature ◽  
Low Energy ◽  
Ion Scattering ◽  
Left Hand ◽  
Low Energy Ion Scattering ◽  
Ion Scattering Spectroscopy ◽  
The Right ◽  
Al Adsorption ◽  
Zigzag Structure

We have investigated Al adsorption on the W (100) surface using LEED and low energy Ion Scattering Spectroscopy (ISS). We observe a p(2 × 1) double domain LEED image for the 1.0 ML Al/W (100) surface at annealing temperature 850°C. We also measured the Al adsorption site at the Al/W (100) — p(2 × 1) surface using ISS. It is found that Al atoms adsorbed at 0.7±0.1 Å aside from the center of the bridge sites with a zigzag structure — one atom adsorbs at the right-hand side and next atom at the left-hand side along the [100] direction. The height of the adsorbed Al atoms is determined to be 1.75±0.15 Å above the W surface layer.

INVESTIGATION OF DEFECT INP(001) SURFACE BY THE METHOD OF LOW ENERGY ION SCATTERING

2019 ◽  
Vol 21 (6) ◽  
pp. 356-361
Author(s):  
M. Karimov ◽  
U. Kutliev ◽  
M. Otaboev
Keyword(s):  
Surface Layer ◽  
Defect Structure ◽  
Binary Collision ◽  
Low Energy ◽  
Ion Scattering ◽  
Energy Distributions ◽  
Low Energy Ion Scattering ◽  
Energy Part ◽  
Grazing Scattering ◽  
Collision Approximation

Investigation of grazing scattering of 3 keV Ar+ and Xe+ ions from the defect surface InP(001) are reported. Computer simulations based on the binary collision approximation permit one to carry out a quantitative analysis of data. It is determined that energy distributions of reflected ions directly depend on the defect structure of the topmost surface layer, and these defects form some peaks in low energy part of energy distribution.

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