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Yuegu Fang1,2, Jiayu Huang1,3, Dong H Zhang1,2,4

  • 1State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, People's Republic of China.

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|November 25, 2025
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We developed a new quantum mechanical method called interaction region decoupling (IRD) to efficiently study complex molecular reactions. This computational strategy significantly reduces costs while maintaining high accuracy for challenging chemical processes.

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Area of Science:

  • Quantum chemistry
  • Chemical kinetics
  • Computational physics

Background:

  • Accurate quantum mechanical treatment of molecular reactions is computationally demanding.
  • Reactions with deep potential wells and long-lived intermediates pose significant challenges.
  • Existing methods struggle with efficiency for complex reaction systems.

Purpose of the Study:

  • To introduce a novel computational strategy for efficient quantum mechanical treatment of molecular reactions.
  • To address the computational challenges in studying reactions with deep potential wells and intermediate complexes.
  • To enable routine quantum mechanical calculations for previously intractable four-atom reactions.

Main Methods:

  • Developed an interaction region decoupling (IRD) strategy using structured imaginary potentials.
  • Dynamically partitioned the interaction region into reactant and product subspaces.
  • Integrated IRD with time-dependent wave packet (TDWP) propagation and region-specific basis sets.

Main Results:

  • Achieved state-resolved accuracy for benchmark reactions (F + HD and O + OH).
  • Reduced computational cost by over 2 orders of magnitude compared to standard methods.
  • Demonstrated the effectiveness of IRD for complex-forming reactions.

Conclusions:

  • The IRD strategy offers a computationally efficient and accurate approach for quantum mechanical reaction studies.
  • This method significantly lowers the barrier for investigating complex-forming four-atom reactions.
  • Paves the way for routine quantum mechanical treatment of challenging chemical dynamics.