Light–Matter Interactions as Drivers of Chemical Transformation: A Comprehensive Analysis of Photon-Induced Processes, Quantum Effects, and Molecular Dynamics in Modern Chemistry

Abstract

Authors: Dr. Aarav N. Chatterjee, Dr. Meenakshi R. Devkar

ABSTRACT: Light–matter interactions have emerged as one of the most transformative domains within modern chemistry, offering pathways to manipulate molecular structure, reaction kinetics, and energy transfer with extraordinary precision. From fundamental photochemical processes to advanced applications in spectroscopy, photocatalysis, and quantum-controlled reactions, the interplay between electromagnetic radiation and molecular systems defines a central pillar of chemical sciences. This paper presents a comprehensive discussion on the underlying principles, mechanisms, and technological relevance of light– matter interactions. Emphasis is placed on excitation dynamics, energy relaxation pathways, nonlinear optical effects, strong and weak coupling regimes, and the role of photonic environments in modifying reactivity. Additionally, the paper explores current limitations, emerging opportunities, and future research directions that continue to revolutionize photochemistry and related disciplines.

KEYWORDS: Light–matter interactions; photochemistry; photon absorption; excited states; molecular dynamics; spectroscopy; photocatalysis; strong coupling; quantum control; energy transfer.