Observation of All the Intermediate Steps of a Chemical Reaction on an Oxide Surface by Scanning Tunneling Microscopy

ACS Nano ◽  
2009 ◽  
Vol 3 (3) ◽  
pp. 517-526 ◽  
Author(s):  
Jesper Matthiesen ◽  
Stefan Wendt ◽  
Jonas Ø. Hansen ◽  
Georg K. H. Madsen ◽  
Estephania Lira ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Chemical Reaction ◽  
Scanning Tunneling ◽  
Oxide Surface ◽  
Tunneling Microscopy

Scanning tunneling microscopy assisted oxide surface etching

1991 ◽  
Vol 69 (3) ◽  
pp. 1707-1711 ◽  
Author(s):  
D. Saulys ◽  
G. Rudd ◽  
E. Garfunkel
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Oxide Surface ◽  
Tunneling Microscopy ◽  
Surface Etching

PHOTOINDUCED PRODUCTS IN A C60 MONOLAYER ON ${\rm Si}(111) (\sqrt{3}\times \sqrt{3})\hbox{-}{\rm Ag}$: AN STM STUDY

1999 ◽  
Vol 06 (06) ◽  
pp. 1073-1078 ◽  
Author(s):  
T. NAKAYAMA ◽  
J. ONOE ◽  
K. NAKATSUJI ◽  
J. NAKAMURA ◽  
K. TAKEUCHI ◽  
...  
Keyword(s):  
Visible Light ◽  
Scanning Tunneling Microscopy ◽  
Chemical Reaction ◽  
Three Dimensional ◽  
Covalent Bond ◽  
Scanning Tunneling ◽  
Two Dimensional ◽  
Tunneling Microscopy ◽  
Other Regarding ◽  
Stm Images

Irradiation of ultraviolet-visible light onto a C 60 monolayer on [Formula: see text] resulted in a chemical reaction between adjacent C 60 molecules, as confirmed by scanning tunneling microscopy (STM) images. The major photoinduced products were double-bonded (two covalent C–C bonds between molecules) C 60 dimers and linear trimers. We also found single-bonded (single covalent bond between molecules) C 60 dimers and linear trimers, and two-dimensional C 60 oligomers as minor products. Observed atomic geometry of the nonbonding contact between a C 60 dimer (or a trimer) and a neighboring dimer (or a trimer), which are parallel to each other regarding their axes, is different from that reported between C 60 molecules in three-dimensional C 60 crystals, where there is no interaction with a substrate.

A Surface Raman and Scanning Tunneling Microscopy Study of The Spatial Distribution of Corner-Sharing and Edge-Sharing Octahedra on thermally Oxidized Tungsten

1997 ◽  
Vol 495 ◽  
Author(s):  
Matthew J. Côté ◽  
Corey Radloff ◽  
Joseph M. Osman ◽  
Rebecca Bussjager ◽  
R. Martin Villarica ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Scanning Tunneling Microscopy ◽  
Power Density ◽  
Laser Power ◽  
Laser Power Density ◽  
Qualitative Description ◽  
Scanning Tunneling ◽  
Oxide Surface ◽  
Tunneling Microscopy ◽  
Defect Sites

ABSTRACTWe have measured the dependence of the strength of Raman activity of polycrystalline m-WO3 on spot size at constant laser power density. These data are compared to surface area scaling measurements obtained using scanning tunneling microscopy. We argue that the spatial distribution of scattering centers is the complement of the spatial distribution of crystallographic shear (CS) structures on or near the oxide surface. Our results are consistent with there being an essentially uniform spatial distribution of scattering sites which implies the spatial distribution of defect sites is also uniform. At the laser power density involved and at the defect densities studied, we found no evidence suggesting a large amount of cooperativity in the formation of CS structures. These results suggest a qualitative description of the structure of common oxide surfaces in agreement with a basic assumption of the JMAK theory of first order phase transformations.

A study on α-RuCl3 crystal structure by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 30-31
Author(s):  
H.-J. Cantow ◽  
H. Hillebrecht ◽  
S. Magonov ◽  
H. W. Rotter ◽  
G. Thiele
Keyword(s):  
Crystal Structure ◽  
Density Distribution ◽  
Scanning Tunneling Microscopy ◽  
Electron Density ◽  
Structure Determination ◽  
Electron Density Distribution ◽  
Scanning Tunneling ◽  
Monoclinic Space Group ◽  
Tunneling Microscopy ◽  
X Ray

From X-ray analysis, the conclusions are drawn from averaged molecular informations. Thus, limitations are caused when analyzing systems whose symmetry is reduced due to interatomic interactions. In contrast, scanning tunneling microscopy (STM) directly images atomic scale surface electron density distribution, with a resolution up to fractions of Angstrom units. The crucial point is the correlation between the electron density distribution and the localization of individual atoms, which is reasonable in many cases. Thus, the use of STM images for crystal structure determination may be permitted. We tried to apply RuCl3 - a layered material with semiconductive properties - for such STM studies. From the X-ray analysis it has been assumed that α-form of this compound crystallizes in the monoclinic space group C2/m (AICI3 type). The chlorine atoms form an almost undistorted cubic closed package while Ru occupies 2/3 of the octahedral holes in every second layer building up a plane hexagon net (graphite net). Idealizing the arrangement of the chlorines a hexagonal symmetry would be expected. X-ray structure determination of isotypic compounds e.g. IrBr3 leads only to averaged positions of the metal atoms as there exist extended stacking faults of the metal layers.

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