Localized and delocalized states, meaning? in Organics

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SUMMARY

The discussion centers on the concepts of localization and delocalization in Quantum Molecular Physics, specifically in relation to spectroscopy and allowed transitions. Participants seek a clear, non-mathematical explanation of these terms, particularly in the context of eigenstates within molecular systems. The mention of "Intersystem Crossing" highlights the transition between Charge Transfer states and locally excited states, emphasizing the significance of understanding these phenomena in molecular interactions. The inquiry aims to clarify how localized and delocalized states manifest physically in various systems.

PREREQUISITES
  • Basic understanding of Quantum Molecular Physics
  • Familiarity with molecular orbitals and eigenstates
  • Knowledge of spectroscopy principles
  • Concept of Intersystem Crossing in molecular transitions
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  • Research the concept of localized molecular orbitals in Quantum Chemistry
  • Study the principles of Intersystem Crossing and its implications in spectroscopy
  • Explore the differences between Charge Transfer states and locally excited states
  • Learn about eigenstate behavior in simple quantum systems
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Students and researchers in Quantum Molecular Physics, chemists focusing on spectroscopy, and anyone interested in the behavior of molecular states and transitions.

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Looking (if possible for some of you) a concise but non mathematical explanation of the terms localization and delocalization?
This questions is related to Quantum Molecular Physics. When reading a paper of Spectroscopy and allowed transitions, I encounter the following phrase " [Intersystem Crossing]... between Charge Transfer state and locally excited state ...". So for sake of argument, let's assume that we are not talking about especific states e.g. charged or excited, but that we are discussing different eigenstates of simple system (not necessarily H atom or alike), at least one system that can have delocalized and localized states, is that possible? what do these terms mean physically? Thanks in advance
 
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