Quantum–Electrochemical Correlation of Vibrational Bond Dynamics in Plant Tissues Probed by Photoacoustic Spectroscopy

This work integrates photoacoustic spectroscopy (PAS), Bragg diffraction, and electrochemical methods (EIS, CV) with a quantum-mechanical framework to investigate the vibrational and electronic properties of plant tissues. Experimental measurements revealed that sunlight and shadow conditions induce significant shifts in S–S, C–S, C–H, and S=O vibrational modes, which directly correlate with variations in charge-transfer resistance (Rct) and conductivity. By employing a Schrödinger-based model, we establish a predictive relation linking bond stiffness (Δk) with conductivity changes (Δσ), validating the role of electron–phonon coupling in charge transport. This unified approach bridges theoretical quantum physics with spectroscopy and electrochemistry, offering a robust tool for describing vibrational–electronic interactions. The results highlight potential applications in optoelectronic sensors, energy storage, smart agriculture, and bioelectronics.