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The Hitchhiker's Guide to the Wave Function∥.

Yu Liu1,2, Terry J Frankcombe3, Timothy W Schmidt1

  • 1ARC Centre of Excellence in Exciton Science, School of Chemistry, UNSW, Sydney, New South Wales 2052, Australia.

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This study introduces "wave function tiles" to visualize complex molecular electronic structures in their full dimensionality. This novel approach reveals chemical motifs and electron behavior, offering insights beyond traditional molecular orbitals.

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Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Molecular Modeling

Background:

  • Molecular wave functions are high-dimensional (3N) and difficult to visualize.
  • Traditional molecular orbitals offer limited, non-unique representations of electronic structure.
  • Multireference wave functions pose challenges for standard orbital descriptions.

Purpose of the Study:

  • To develop a method for visualizing the full dimensionality of molecular wave functions.
  • To incorporate electron correlation effects into visualization.
  • To provide a new perspective on electronic structure beyond molecular orbitals.

Main Methods:

  • Developing a
  • wave function tile
  • representing a 3N-dimensional repeating unit based on fermionic behavior.
  • Projecting the wave function tile onto individual electron dimensions for analysis.
  • Analyzing wave functions of molecules like benzene and C2.

Main Results:

  • Wave function tiles reproduce canonical chemical motifs (core electrons, single bonds, lone pairs).
  • Multiple bonds are visualized as Pauling's
  • banana bonds
  • .
  • Electron motions during reactions correspond to organic chemists' curly arrow notation.
  • Resonance structures and electron correlation effects are revealed.

Conclusions:

  • Fermionic tiling provides unique insights into wave functions, surpassing orbital or configuration interaction analysis.
  • This method visualizes electron correlation in benzene and supports a novel bonding description for C2.