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Summary
This summary is machine-generated.

The Becke-Lee-Yang-Parr "half-and-half" functional (BH&H-LYP) with 50% exact exchange offers accuracy comparable to B3LYP for thermochemistry and excitation energies. This challenges the notion that higher exact exchange percentages harm accuracy, making BH&H-LYP a viable option for self-interaction error dominated systems.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Theoretical Chemistry

Background:

  • Hybrid density functionals offer improved accuracy over semilocal functionals.
  • Conventional wisdom suggests limiting exact exchange to 20-25% to maintain thermochemical accuracy.
  • The Becke-Lee-Yang-Parr
  • half-and-half
  • functional (BH&H-LYP) is often used for systems with self-interaction error, particularly in time-dependent density functional theory (TDDFT) for excitation energies.

Purpose of the Study:

  • To investigate the assumption that 50% Hartree-Fock exchange in hybrid functionals compromises thermochemical accuracy.
  • To evaluate the performance of functionals with varying percentages of exact exchange (B(α)LYP) across different chemical properties.
  • To determine the optimal percentage of exact exchange for general chemical applications.

Main Methods:

  • Systematic variation of the percentage of exact exchange (α) in B(α)LYP functionals.
  • Assessment of thermochemical properties, including atomization energies and reaction barrier heights.
  • Evaluation of excitation energies using time-dependent density functional theory (TDDFT).

Main Results:

  • BH&H-LYP (α = 50%) demonstrates accuracy comparable to B3LYP for thermochemistry and barrier heights.
  • BH&H-LYP shows similar accuracy to B3LYP for excitation energies, though B3LYP is superior for valence excitations.
  • A significant decrease in accuracy for atomization energies is the primary drawback of BH&H-LYP compared to B3LYP.

Conclusions:

  • The conventional taboo against using >25% exact exchange is not universally justified, as BH&H-LYP (50% exact exchange) offers competitive accuracy for many properties.
  • BH&H-LYP is a suitable choice for systems dominated by self-interaction error, such as charge-transfer complexes and core-level excitations.
  • BH&H-LYP presents an acceptable compromise for valence excitation energies, and its use for ground-state properties does not warrant undue concern regarding diminished accuracy.