Dynamic Studies of Potential Energy Surfaces

Dynamic studies of potential energy surfaces (PES) explore how molecular systems evolve across energy landscapes defined by nuclear positions. High-accuracy PES construction enables the mapping of minima, transition states and reaction pathways that dictate reaction mechanisms and kinetics. Methods such as quasi-classical trajectory and time-dependent wave packet techniques probe the influence of barrier heights, well depths and topographical features on cross sections and rate constants. Advances in ab initio electronic structure, many-body expansions and machine-learning fits have sharpened the global description of reactive systems, from simple diatomics to polyatomics. Such insights underpin applications in atmospheric chemistry, astrochemistry, combustion and materials science, where predictive modelling of reaction networks and energy transfer processes is paramount.

Research from Nature Portfolio

A many-body expansion PES was developed for the ground electronic state of HCS, achieving complete basis set quality through extrapolation of high-level multireference ab initio data. Detailed topographical analysis revealed accurate well depths and barrier heights, which were used in quasi-classical trajectory simulations of the C(3P)+SH(X2Π)→H(2S)+CS(X1Σ+) reaction. Trajectories across key saddle points illuminated energy partitioning, angular distributions and the role of intermediates, providing a benchmark for subsequent dynamical studies on similar triatomic systems.

Dynamic Studies of Potential Energy Surfaces publication trend

The graph below shows the total number of articles in dynamic studies of potential energy surfaces across all publications each year (not limited to Nature Index journals).

Technical terms

Potential Energy Surface (PES): A multidimensional hypersurface representing the potential energy of a molecular system as a function of nuclear coordinates.

Quasi-classical Trajectory (QCT): A simulation method that uses classical mechanics to approximate nuclear motion on a PES, often seeded with quantum-derived initial conditions.

Ab initio methods: Electronic structure techniques based on first principles, typically involving wavefunction or density-functional theory calculations without empirical parameters.

Transition State: A high-energy configuration at a saddle point on the PES corresponding to the barrier between reactants and products.

References

1. Globally accurate potential energy surface for the ground-state HCS(X2A′) and its use in reaction dynamics. Scientific Reports (2016).
2. Reaction dynamics of P(4S) + O2(X3Σg-) → O(3P) + PO(X2Π) on a global CHIPR potential energy surface of PO2(X2A1): implications for atmospheric modelling. Atmospheric Chemistry and Physics (2023).
3. Accurate global potential energy surface for the ground state of CH 2 + by extrapolation to the complete basis set limit. RSC Advances (2018).