Nonadiabatic Dynamics in Molecular Photochemistry
Summary
Nonadiabatic dynamics govern ultrafast transitions between electronic states in photoexcited molecules, a regime in which the Born–Oppenheimer approximation breaks down and nuclear and electronic motions become strongly coupled. Upon photon absorption, a molecule is promoted to an excited-state potential energy surface; subsequent nuclear motion can bring the system to regions of degeneracy known as conical intersections, which act as funnels that redistribute population between states on femtosecond timescales. Vibronic coupling, the interplay of vibrational and electronic degrees of freedom, drives wavepacket evolution across these multidimensional landscapes and dictates pathways for processes such as internal conversion, photoisomerisation and bond cleavage. Intersystem crossing may further channel population into triplet manifolds, influencing fluorescence yields and photostability. Recent advances in ultrafast spectroscopy, combined with high-level quantum-chemical dynamics simulations, have revealed detailed relaxation pathways and demonstrated opportunities to control photochemical outcomes by selective vibrational-mode excitation. Insights from this field underpin the design of light-responsive materials, molecular machines and more efficient photovoltaic and phototherapeutic systems.
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Nonadiabatic Dynamics in Molecular Photochemistry publication trend
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Technical terms
Nonadiabatic dynamics: Coupled motion of electrons and nuclei enabling transitions between electronic states beyond the Born–Oppenheimer approximation.
Conical intersection: A point of degeneracy between two electronic states on potential energy surfaces that allows ultrafast nonradiative transitions.
Potential energy surface: A multidimensional landscape mapping molecular energy as a function of nuclear coordinates, guiding reaction pathways.
Vibronic coupling: Interaction between electronic and vibrational states that facilitates nonadiabatic transitions across surfaces.
Intersystem crossing: A nonradiative transition between electronic states of different spin multiplicity, commonly from singlet to triplet configurations.
References
- Femtosecond Time-Resolved Observation of Relaxation and Wave Packet Dynamics of the S1 State in Electronically Excited o-Fluoroaniline. Molecules (2023).
- Exploring quantum phenomena and vibrational control in σ* mediated photochemistry. Chemical Science (2013).
- Experimental observation of nonadiabatic bifurcation dynamics at resonances in the continuum. Chemical Science (2019).
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