Transient Raman Spectroscopy for Probing Charge Transfer States
Charge transfer (CT) states form the basis for multitude of chemical reactions, and has become relevant due to its ubiquity in all light energy conversion paradigms. In order to discover new materials with optimized charge transfer rates at molecular interfaces for energy conversion technologies, it is imperative to diagnose the structure-function corrleations “in operando”. Tracking the non-equilibrium nuclear dynamics leading up to the charge transfer states and probing the subsequent separation of charges requires time-resolved spectroscopy with structural sensitivity. In this talk, I will discuss the utility of transient Raman spectroscopy as a tool to structurally probe the formation of CT states in molecular dyes with large Stokes shift, and uncover the hidden lengthscale of the photochemistry inside the active site of metalloproteins. Both frequency domain and time-domain methods will be elaborated with emphasis on challenges of real-time Raman detection during chemical reactions.
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3. Soumyajit Mitra, ASR Koti, and Jyotishman Dasgupta; to be submitted.