Non-Markovian Electron Transfer in Ligand–Receptor Complexes: Insights from Non-Gaussian Anharmonic Baths

sparse-event regime, where impulsive events drive pronounced, irregular energy exchange and the largest deviations from harmonic-bath behavior. These results delineate when harmonic approximations are sufficient and when explicit anharmonic, non-Gaussian bath models are required for faithful ET dynamics in biomolecular environments.