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Related Concept Videos

Electron Configurations02:46

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Electronic structure of Sn/Cu(100)-[Formula: see text].

J Martínez-Blanco1, V Joco, J Fujii

  • 1Departamento de Física de la Materia Condensada and Instituto Universitario de Ciencia de Materiales 'Nicolás Cabrera', Universidad Autónoma de Madrid, E-28049 Madrid, Spain.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 6, 2011
PubMed
Summary

Measurements reveal a stable surface phase of tin on copper(100) with a unique electronic structure. This tin phase exhibits a free-electron-like surface band and lacks temperature-induced transitions, unlike other observed surface phases.

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Area of Science:

  • Surface science
  • Condensed matter physics
  • Materials science

Background:

  • Understanding surface phases is crucial for catalysis and electronics.
  • Previous studies on Sn/Cu(100) showed temperature-dependent reconstructions.
  • Characterizing novel surface electronic structures provides fundamental insights.

Purpose of the Study:

  • To investigate the Fermi surface and band structure of a specific Sn/Cu(100) surface phase.
  • To determine the electronic properties and stability of this phase.
  • To compare its behavior with other known Sn/Cu(100) surface phases.

Main Methods:

  • Low-energy electron diffraction (LEED) for structural analysis.
  • Angle-resolved photoemission spectroscopy (ARPES) for electronic structure mapping.
  • Variable temperature measurements from 100 K to desorption.

Main Results:

  • Identified a distinct Sn/Cu(100) surface phase at 0.60-0.65 monolayers coverage.
  • Observed a free-electron-like surface band, modulated by the surface reconstruction periodicity.
  • Found no evidence of temperature-induced phase transitions for this specific phase up to Sn desorption.

Conclusions:

  • The characterized Sn/Cu(100) phase possesses a stable, unique electronic structure.
  • The absence of phase transitions differentiates it from other Sn/Cu(100) surface reconstructions.
  • This finding contributes to the understanding of surface alloy formation and electronic properties.