Two bridge-particle-mediated RET between chiral molecules

Area of Science:

• Quantum Electrodynamics
• Molecular Physics
• Spectroscopy

Background:

• Resonance energy transfer (RET) is crucial for understanding energy migration in molecular systems.
• Chiral molecules exhibit unique optical properties influencing energy transfer mechanisms.
• Mediated transfer, involving bridging particles, adds complexity to RET dynamics.

Purpose of the Study:

• To theoretically investigate resonance energy transfer between chiral molecules mediated by bridging particles.
• To elucidate the role of virtual photons and multipole couplings in chiral RET.
• To analyze the influence of molecular geometry and properties on energy transfer rates.

Main Methods:

• Application of molecular quantum electrodynamics (QED) theory.
• Utilizing fourth-order diagrammatic perturbation theory to calculate probability amplitudes.
• Employing electric dipole, quadrupole, and magnetic dipole couplings.
• Analysis of Fermi's golden rule rate contributions for various multipole moments.

Main Results:

• A theoretical framework was established for bridge-mediated RET between chiral molecules.
• Transfer rates are dependent on the specific multipole moments of the donor, acceptor, and mediators.
• Mixed electric dipole-quadrupole contributions vanish in fluid phases for chiral systems.
• Maximum transfer rates are observed for collinear geometries.
• A multi-level mediator model is essential for accurate energy migration prediction.

Conclusions:

• Molecular QED provides a robust framework for understanding complex RET phenomena.
• The study offers insights into radiationless and radiative transfer mechanisms in chiral systems.
• Findings are crucial for designing molecular systems with controlled energy transfer properties.