Doubly Degenerate Meaning: Molecular Orbitals Explained

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SUMMARY

The term "doubly degenerate" in molecular orbitals refers to two states that possess the same energy level. In this context, "E" indicates a doubly degenerate state, while "T" signifies a triply degenerate state, and "A" denotes a singly degenerate state. Specifically, "A2g" represents a singly degenerate orbital, which is characterized by having a single energy level. Understanding these classifications is crucial for grasping the behavior of molecular orbitals in quantum chemistry.

PREREQUISITES
  • Basic knowledge of molecular orbital theory
  • Familiarity with quantum chemistry terminology
  • Understanding of energy levels in atomic and molecular systems
  • Concept of degeneracy in quantum mechanics
NEXT STEPS
  • Research the differences between singly, doubly, and triply degenerate orbitals
  • Study the implications of molecular symmetry on orbital degeneracy
  • Learn about the role of group theory in molecular orbital theory
  • Explore examples of molecular orbitals in transition metal complexes
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Chemistry students, quantum chemists, and anyone interested in the theoretical aspects of molecular orbitals and their energy levels.

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What does "doubly degenerate" mean, when discussing molecular orbitals?
 
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It means two (doubly) states has the same energy level.
 
I read that E (such as in Eg) means doubly degenerate and T (as in T2g) is triply degenerate and A (as in A2g) is singly degenerate. The first 2 I understand but what is singly degenerate? Isn't singly degenerate just a single orbital?
 

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