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Updated: Jul 16, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Accurate Potential Energy Surfaces Using Atom-Centered Potentials and Minimal High-Level Data.

Mahsa Nazemi Ashani1, Qinan Huang1, A Mackenzie Flowers2

  • 1Department of Chemistry, University of British Columbia, 3247 University Way, Kelowna, British Columbia V1V 1V7, Canada.

The Journal of Physical Chemistry. A
|September 15, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a cost-effective Δ-density functional theory (Δ-DFT) method using atom-centered potentials (ACPs) to accurately model potential energy surfaces (PESs) and vibrational frequencies for HONO and HFCO molecules.

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry
  • Quantum Chemistry

Background:

  • Accurate potential energy surfaces (PESs) are crucial for understanding molecular behavior.
  • High-level computational methods for PESs can be computationally expensive.
  • Developing efficient and accurate methods for PES calculations is an ongoing challenge.

Purpose of the Study:

  • To demonstrate the efficacy of a Δ-density functional theory (Δ-DFT) approach utilizing atom-centered potentials (ACPs).
  • To accurately represent potential energy surfaces (PESs) and calculate vibrational frequencies for HONO and HFCO molecules.
  • To establish a computationally inexpensive yet accurate method for molecular property calculations.

Main Methods:

  • Employed a Δ-density functional theory (Δ-DFT) approach with atom-centered potentials (ACPs).
  • Utilized a limited set of high-accuracy reference energies (CCSD(T)-F12a) to develop ACPs.
  • Applied the multiconfigurational time-dependent Hartree (MCTDH) method with ACP-corrected B3LYP/def2-TZVPP potential energy surfaces.

Main Results:

  • Achieved low mean absolute errors for PESs of HONO (27.7 cm⁻¹) and HFCO (5.8 cm⁻¹) using as few as 100 reference energies.
  • Calculated vibrational frequencies for HONO isomers with mean absolute percent errors (MAPEs) comparable to high-level CCSD(T)-F12a methods (0.8-1.1%).
  • Obtained highly accurate vibrational frequencies for HFCO with a MAPE of 0.1%, matching the performance of CCSD(T)-F12a/MCTDH.

Conclusions:

  • The atom-centered potential (ACP) approach within Δ-DFT provides a computationally inexpensive and accurate method for PES representation.
  • This method successfully models PESs and vibrational frequencies, achieving accuracy comparable to high-level ab initio calculations.
  • The ACP approach shows promise as a general protocol for accurate molecular property calculations.