Electronic structure of Ag-induced3×3and21×21superstructures on the Si(111) surface studied by angle-resolved photoemission spectroscopy and scanning tunneling microscopy

2001 ◽  
Vol 64 (20) ◽  
Author(s):  
Xiao Tong ◽  
Satoru Ohuchi ◽  
Norio Sato ◽  
Takehiro Tanikawa ◽  
Tadaaki Nagao ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Photoemission Spectroscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Kekulene: On-Surface Synthesis, Orbital Structure, and Aromatic Stabilization

2020 ◽  
Author(s):  
Anja Haags ◽  
Alexander Reichmann ◽  
Qitang Fan ◽  
Larissa Egger ◽  
Hans Kirschner ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Density Functional ◽  
Photoemission Spectroscopy ◽  
Scanning Tunneling ◽  
Orbital Structure ◽  
Tunneling Microscopy ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Highest Occupied Molecular Orbital ◽  
Shed Light ◽  
Aromatic Stabilization

We revisit the question of kekulene’s aromaticity by focusing on the electronic structure of its frontier orbitals as determined by angle-resolved photoemission spectroscopy. To this end, we have developed a specially designed precursor, 1,4,7(2,7)-triphenanthrenacyclononaphane-2,5,8-triene, which allows us to prepare sufficient quantities of kekulene of high purity directly on a Cu(111) surface, as confirmed by scanning tunneling microscopy. Supported by density functional calculations, we determine the orbital structure of kekulene’s highest occupied molecular orbital by photoelectron tomography. In agreement with a recent aromaticity assessment of kekulene based solely on C–C bond lengths, we conclude that the π-conjugation of kekulene is better described by the Clar model rather than a superaromatic model. Thus, by exploiting the capabilities of photoemission tomography, we shed light on the question which consequences aromaticity holds for the frontier electronic structure of a π-conjugated molecule.<br>

scholarly journals Kekulene: On-Surface Synthesis, Orbital Structure, and Aromatic Stabilization

2020 ◽  
Author(s):  
Anja Haags ◽  
Alexander Reichmann ◽  
Qitang Fan ◽  
Larissa Egger ◽  
Hans Kirschner ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Density Functional ◽  
Photoemission Spectroscopy ◽  
Scanning Tunneling ◽  
Orbital Structure ◽  
Tunneling Microscopy ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Highest Occupied Molecular Orbital ◽  
Shed Light ◽  
Aromatic Stabilization

We revisit the question of kekulene’s aromaticity by focusing on the electronic structure of its frontier orbitals as determined by angle-resolved photoemission spectroscopy. To this end, we have developed a specially designed precursor, 1,4,7(2,7)-triphenanthrenacyclononaphane-2,5,8-triene, which allows us to prepare sufficient quantities of kekulene of high purity directly on a Cu(111) surface, as confirmed by scanning tunneling microscopy. Supported by density functional calculations, we determine the orbital structure of kekulene’s highest occupied molecular orbital by photoelectron tomography. In agreement with a recent aromaticity assessment of kekulene based solely on C–C bond lengths, we conclude that the π-conjugation of kekulene is better described by the Clar model rather than a superaromatic model. Thus, by exploiting the capabilities of photoemission tomography, we shed light on the question which consequences aromaticity holds for the frontier electronic structure of a π-conjugated molecule.<br>

Room temperature observation of the correlation between atomic and electronic structure of graphene on Cu(110)

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98001-98009 ◽  
Author(s):  
Thais Chagas ◽  
Thiago H. R. Cunha ◽  
Matheus J. S. Matos ◽  
Diogo D. dos Reis ◽  
Karolline A. S. Araujo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Chemical Vapor Deposition ◽  
Scanning Tunneling Microscopy ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Observation ◽  
Atomic And Electronic Structure

We have used atomically-resolved scanning tunneling microscopy and spectroscopy to study the interplay between the atomic and electronic structure of graphene formed on copper via chemical vapor deposition.

Local Electronic Structure in Ordered Aggregates of Carbon Nanotubes: Scanning Tunneling Microscopy/scanning Tunneling Spectroscopy Study

1998 ◽  
Vol 13 (9) ◽  
pp. 2389-2395 ◽  
Author(s):  
D. L. Carroll ◽  
P. M. Ajayan ◽  
S. Curran
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Local Density ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Spatially Resolved ◽  
Local Electronic Structure

The recent application of tunneling probes in electronic structure studies of carbon nanotubes has proven both powerful and challenging. Using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), local electronic properties in ordered aggregates of carbon nanotubes (multiwalled nanotubes and ropes of single walled nanotubes) have been probed. In this report, we present evidence for interlayer (concentric tube) interactions in multiwalled tubes and tube-tube interactions in singlewalled nanotube ropes. The spatially resolved, local electronic structure, as determined by the local density of electronic states, is shown to clearly reflect tube-tube interactions in both of these aggregate forms.

Morphology and electronic structure of Gd wires studied with scanning tunneling microscopy

1998 ◽  
Vol 66 (7) ◽  
pp. S1195-S1198 ◽  
Author(s):  
A. Mühlig ◽  
T. Günther ◽  
A. Bauer ◽  
K. Starke ◽  
B.L. Petersen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy
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