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Updated: Jun 24, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Theoretical study on exciton recurrence motion in anthracene dimer using the Ab initio MO-CI based quantum master
Ryohei Kishi1, Masayoshi Nakano, Takuya Minami
1Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. rkishi@cheng.es.osaka-u.ac.jp
We investigated ultrafast exciton dynamics in an anthracene dimer using the quantum master equation (MOQME) method. Our findings reveal oscillatory exciton motion between monomers, crucial for understanding energy transfer in such systems.
Area of Science:
- Quantum chemistry
- Photochemistry
- Spectroscopy
Background:
- Ultrafast exciton dynamics are crucial for understanding energy transfer in molecular systems.
- Anthracenophane exhibits experimentally observed oscillatory fluorescence anisotropy decay, indicating complex dynamics.
Purpose of the Study:
- To investigate ultrafast exciton dynamics in an anthracene dimer using the ab initio molecular orbital (MO)-configuration interaction (CI) based quantum master equation (MOQME) method.
- To elucidate the mechanism behind the oscillatory fluorescence anisotropy decay observed in anthracenophane.
Main Methods:
- Application of the ab initio MO-CI based quantum master equation (MOQME) method.
- Modeling an anthracene dimer system.
- Numerical solution of the quantum master equation for reduced exciton density matrices.
- Analysis of polarization dynamics and exciton distribution.
Main Results:
- Identification of two low-lying, near-degenerate excited states with a small energy difference (42 cm(-1)).
- Observation of field-induced polarization oscillations and slower amplitude oscillations of x- and z-polarizations.
- Association of slower oscillations with exciton recurrence motion between monomers.
Conclusions:
- Exciton recurrence motion is characterized by eigenfrequency differences and relative phases of frontier molecular orbitals.
- The MOQME method provides insights into ultrafast exciton dynamics and energy transfer mechanisms.
- Understanding these dynamics is key for designing novel photoactive materials.
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