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Summary
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This study introduces a new computational method combining nonadiabatic molecular dynamics and spin-flip time-dependent density functional theory (SF-TDDFT) for accurate simulations of molecular reactions. The approach effectively models the crucial S1 to S0 state transitions, improving computational efficiency.

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry
  • Quantum Chemistry

Background:

  • Conventional single-reference methods struggle with describing conical intersections between electronic states (S0/S1).
  • Accurate modeling of nonadiabatic transitions (S1 → S0) is crucial for understanding photochemical reactions.

Purpose of the Study:

  • To develop and validate a computational method combining nonadiabatic molecular dynamics with spin-flip time-dependent density functional theory (SF-TDDFT).
  • To accurately describe the topology of crossing points and model S1 → S0 nonadiabatic transitions.

Main Methods:

  • Utilized Tully's fewest switch surface hopping algorithm.
  • Incorporated an analytic SF-TDDFT nonadiabatic coupling vector into the simulation.
  • Applied the method to photoisomerization reactions of E-azomethane, methanimine, and ethene.

Main Results:

  • The SF-TDDFT approach correctly describes the topology of S0/S1 conical intersections.
  • The method successfully models S1 → S0 nonadiabatic transitions, reproducing results from multireference methods.
  • Achieved accurate dynamics on the S1 state and recovery of the S0 state.

Conclusions:

  • The proposed method overcomes limitations of single-reference calculations for S1 → S0 transitions.
  • SF-TDDFT combined with surface hopping offers a computationally efficient and accurate approach for photochemical reaction dynamics.
  • This method provides a robust tool for studying nonadiabatic processes in molecular systems.