Typical binding energies of sigma-orbitals

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SUMMARY

The discussion centers on the electron binding energies of conjugated materials, specifically pentacene. The carbon 1s energy is established at -285 eV, while typical 2π and 2π* binding energies range from -10 eV to -2 eV, influenced by the size of the conjugated system. The 2σ and 2σ* binding energies, however, are less documented but are expected to be positioned below and above the 2π and 2π* energies, respectively. The inquiry also raises the possibility of 2σ* energies being positive, prompting a reference to Extended Hückel Theory (EHT) for further exploration.

PREREQUISITES
  • Understanding of electron binding energy concepts
  • Familiarity with conjugated materials and their properties
  • Knowledge of Extended Hückel Theory (EHT)
  • Basic principles of molecular orbital theory
NEXT STEPS
  • Research typical binding energies of 2σ and 2σ* orbitals in conjugated systems
  • Study the implications of Extended Hückel Theory (EHT) on binding energies
  • Explore the relationship between conjugated system size and 2π/2π* binding energies
  • Investigate experimental methods for measuring electron binding energies in organic materials
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Researchers in materials science, chemists studying organic semiconductors, and physicists interested in electron binding energy phenomena in conjugated systems.

Nabla94
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I'm interested in typical electron binding energies of conjugated materials such as pentacene. The carbon 1s energy is easy to find in literature (-285 eV), typical 2π and 2π* binding energies are in the range of few eV (-10 eV ... -2 eV) depending on the size of the conjugated system. But typical 2σ and 2σ* binding energies, which should be rather independent of the conjugated system (just like C 1s) are difficult to find. They should be located below and above those of 2π and 2π*, respectively. Does this mean that 2σ* energies are positive?
 
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I would look up parameters from Extended Hückel Theory (EHT).
 

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