Topographic and diffusion measurements of gold and platinum surfaces by scanning tunneling microscopy

1990 ◽  
Vol 94 (26) ◽  
pp. 8926-8932 ◽  
Author(s):  
David A. Sommerfeld ◽  
R. Thomas. Cambron ◽  
Thomas P. Beebe
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Platinum Surfaces ◽  
And Diffusion

The nature of active centers catalyzing oxygen electro-reduction at platinum surfaces in alkaline media

2019 ◽  
Vol 12 (1) ◽  
pp. 351-357 ◽  
Author(s):  
Yunchang Liang ◽  
David McLaughlin ◽  
Christoph Csoklich ◽  
Oliver Schneider ◽  
Aliaksandr S. Bandarenka
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Alkaline Media ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Active Centers ◽  
Reaction Conditions ◽  
Electrochemical Scanning Tunneling Microscopy ◽  
Platinum Surfaces ◽  
Alkaline Electrolytes ◽  
Noise Measurements

The recently introduced electrochemical scanning tunneling microscopy noise measurements were applied to directly identify active centers for oxygen electro-reduction at Pt-based surfaces in three alkaline electrolytes under reaction conditions.

AB Initio Study of the Ge Adsorption and Diffusion on Si (100) Surface

1993 ◽  
Vol 317 ◽  
Author(s):  
V. Milman ◽  
S.J. Pennycook ◽  
D.E. Jesson ◽  
M.C. Payne ◽  
I. Stich
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Total Energy ◽  
Ab Initio ◽  
Binding Sites ◽  
Diffusion Barriers ◽  
Scanning Tunneling ◽  
Ab Initio Study ◽  
Tunneling Microscopy ◽  
And Migration ◽  
And Diffusion

ABSTRACTWe identify the binding sites for adsorption of a single Ge atom on the Si (100) surface using ab initio total energy calculations. The calculated diffusion barriers are in excellent agreement with experimental estimates. Using a large supercell we resolve the controversy regarding the binding geometry and migration path for the adatom, and investigate the influence of the adatom on the buckling of Si dimers. The adatom induces a buckling defect that is frequently observed using scanning tunneling Microscopy (STM); therefore the study of single adatoms may be experimentally accessible.

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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