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Toward Accurate Two-Photon Absorption Spectrum Simulations: Exploring the Landscape beyond the Generalized Gradient

Karan Ahmadzadeh1, Xin Li2, Zilvinas Rinkevicius1,3

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|January 22, 2024
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This summary is machine-generated.

New density functional approximations (DFAs) show improved accuracy for predicting two-photon absorption (2PA) in organic molecules. The MN15 functional, in particular, offers highly accurate rankings for 2PA strengths and excited-state properties.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Two-photon absorption (2PA) is crucial for applications like 3D optical data storage and photodynamic therapy.
  • Accurate prediction of 2PA properties requires sophisticated computational methods.
  • Existing density functional approximations (DFAs) beyond generalized gradient approximation (GGA) have not been thoroughly evaluated for 2PA prediction.

Purpose of the Study:

  • To evaluate the performance of meta-generalized gradient approximation (meta-GGA) density functional approximations (DFAs) for predicting two-photon absorption (2PA) strengths.
  • To compare the accuracy of meta-GGA functionals against established methods and experimental data.
  • To identify the most reliable DFA for calculating 2PA properties of push-pull π-conjugated molecules.

Main Methods:

  • Employed a set of 48 push-pull π-conjugated organic molecules.
  • Utilized meta-GGA functionals: SCAN, MN15, and M06-2X.
  • Applied analytic quadratic response theory and compared results with coupled-cluster (CC2) calculations and experimental data.

Main Results:

  • Meta-GGA functionals demonstrate improved accuracy over previous DFAs for predicting 2PA strengths.
  • The MN15 functional shows particularly promising results, providing accurate chemical rankings for 2PA transition strengths.
  • MN15 also accurately predicts excited-state dipole moments, crucial for understanding 2PA phenomena.

Conclusions:

  • Meta-GGA functionals represent a significant advancement in predicting 2PA properties of π-conjugated systems.
  • The MN15 functional is a highly accurate and reliable choice for computational studies of two-photon absorption.
  • This work provides valuable insights for the design of novel materials with tailored 2PA characteristics.