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Updated: Jun 18, 2025
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
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Electronic dynamics through conical intersections via non-Markovian stochastic Schrödinger equation with complex
1School of Materials, Sun Yat-sen University, Shenzhen, Guangdong 518107, China.
The Journal of Chemical Physics
|August 2, 2024
Summary
Conical intersections (CIs) enable rapid excited-state relaxation in photochemical reactions. This study models CI dynamics in pyrazine using a novel stochastic Schrödinger equation method, validating its accuracy.
Area of Science:
- Photochemistry
- Quantum dynamics
- Theoretical chemistry
Background:
- Conical intersections (CIs) are critical in ultrafast non-adiabatic dynamics.
- They facilitate efficient relaxation pathways for excited electronic states in molecules.
- Understanding CI dynamics is key to predicting photochemical reaction outcomes.
Purpose of the Study:
- To investigate the dynamics of electronic transitions through conical intersections (CIs) in pyrazine.
- To analyze the influence of system-bath coupling and relaxation times on these dynamics.
- To validate a non-Markovian stochastic Schrödinger equation method for simulating CI dynamics.
Main Methods:
- Utilized the non-Markovian stochastic Schrödinger equation with complex modes.
- Employed the linear vibronic coupling model, including intra-state and inter-state interactions.
- Compared results with the hierarchical equations of motion method for validation.
Main Results:
- Simulated the dynamics of excited electronic transitions through CIs in pyrazine.
- Observed the impact of varying system-bath coupling strengths and bath relaxation times.
- Demonstrated the accuracy of the employed method against established techniques.
Conclusions:
- The non-Markovian stochastic Schrödinger equation with complex modes effectively models excited-state dynamics at CIs.
- System-bath coupling and relaxation times significantly influence photochemical reaction pathways.
- This method provides a reliable tool for studying non-adiabatic processes in photochemistry.
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