Structure determination of the indium induced Si(001)-(4 × 3) reconstruction by surface X-ray diffraction and scanning tunneling microscopy

1998 ◽  
Vol 123-124 ◽  
pp. 104-110 ◽  
Author(s):  
O. Bunk ◽  
G. Falkenberg ◽  
L. Seehofer ◽  
J.H. Zeysing ◽  
R.L. Johnson ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Structure Determination ◽  
Scanning Tunneling ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
X Ray

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.

scholarly journals Interface morphology of a Cr(001)/Fe(001) superlattice determined by scanning tunneling microscopy and x-ray diffraction: A comparison

2001 ◽  
Vol 89 (1) ◽  
pp. 181-187 ◽  
Author(s):  
C. M. Schmidt ◽  
D. E. Bürgler ◽  
D. M. Schaller ◽  
F. Meisinger ◽  
H.-J. Güntherodt ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Interface Morphology ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
X Ray

scholarly journals Structural determination of the Si(111) √3×√3-Bi surface by x-ray standing waves and scanning tunneling microscopy

1994 ◽  
Vol 50 (16) ◽  
pp. 12246-12249 ◽  
Author(s):  
J. C. Woicik ◽  
G. E. Franklin ◽  
Chien Liu ◽  
R. E. Martinez ◽  
I.-S. Hwong ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Standing Waves ◽  
Scanning Tunneling ◽  
Structural Determination ◽  
Tunneling Microscopy ◽  
X Ray

Scanning Tunneling Microscopy Imaging of Defects in Layered Compounds

1990 ◽  
Vol 209 ◽  
Author(s):  
G. P. E. M. Van Bakell ◽  
J. Th. M. De Hosson ◽  
T. Hibma
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Structural Features ◽  
Layered Compounds ◽  
Scanning Tunneling ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
Microscopy Imaging ◽  
X Ray ◽  
Sample Orientation ◽  
Stm Images

ABSTRACTStructural features of TiS2 were studied by scanning tunneling microscopy (STM) and single-crystal X-ray diffraction was applied as a complementary technique. STM images in air and at room temperature revealed, beside the trigonal symmetry of the lattice, several new features having this symmetry as well. We conclude that these features not only are to be described by structural defect phenomena which affect octahedral sites in the 1T-CdI2 structure but tetrahedral sites as well. Sample orientation determination by X-ray diffraction provides a unique relation between feature types and sites. A model is proposed in which displaced Ti atoms account for the observed features.

scholarly journals Structural examination of Au/Ge(001) by surface x-ray diffraction and scanning tunneling microscopy

2012 ◽  
Vol 85 (23) ◽  
Author(s):  
S. Meyer ◽  
T. E. Umbach ◽  
C. Blumenstein ◽  
J. Schäfer ◽  
R. Claessen ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
Structural Examination ◽  
X Ray

Structure analysis of thiouracil on Ag(111) and graphite (0001) by x-ray diffraction and scanning tunneling microscopy

1999 ◽  
Vol 214 (12) ◽  
Author(s):  
H. L. Meyerheim ◽  
F. Trixler ◽  
W. Stracke ◽  
W. M. Heckl
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Bond Distance ◽  
Pyrimidine Ring ◽  
Unit Cell ◽  
Scanning Tunneling ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
X Ray ◽  
Covalent Interaction ◽  
Inert Surface

AbstractThe geometric structures of ordered monolayers of large organic molecules (thiouracil) adsorbed to the surface of Ag(111) and graphite (0001) were analyzed using surface x-ray diffraction and scanning tunneling microscopy (STM), respectively. Although the substrates are different, in both cases the molecules are found to be arranged in parallel zig-zag rows. On graphite (0001) the molecules form a unit cell similar to the ([unk]1[unk])plane of the bulk crystal whereas on Ag(111) the detailed x-ray analysis gives evidence that, in contrast to the bulk structure, all but one of the intermolecular hydrogen bonds present in the bulk are broken. The intact pyrimidine rings are tilted by about 30° with respect to the Ag surface in comparison to flat lying molecules on graphite. An elongation of the C=S bond distance by 0.16(7) Å and an increase of the intra-pyrimidine-ring distances by about 0.11(10) Å relative to the bulk is observed which can be attributed to the covalent interaction of the molecule with the substrate. We conclude that for an inert surface like graphite, where the molecules merely interact by van der Waals forces, the molecules build a unit cell mainly determined by intermolecular hydrogen bridge bonds and therefore almost unchanged with respect to the bulk, whereas even in the case of a weakly interacting surface like Ag(111) the crystal structure can considerably be altered with respect to the bulk.

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