Peer-reviewed Publication by Science CRO

This manuscript applies real-time time-dependent density functional theory with ab initio quantum chemical determinations to characterize superoxide dynamics, revealing its intrinsic free oscillation rate through first-principles electronic structure simulation.

Methodological details

Electronic structure calculations were performed using real-time time-dependent density functional theory, propagating the Kohn–Sham equations explicitly in time to resolve ultrafast electron density oscillations without perturbative approximations.

Ab initio quantum chemical determinations defined ground and excited state manifolds, orbital energies, and spin densities. Exchange–correlation functionals were benchmarked to ensure convergence and numerical stability of time propagation.

The superoxide anion was simulated in isolation to eliminate solvent-induced damping. Fourier transformation of time-resolved dipole and density fluctuations enabled extraction of the intrinsic, undriven oscillation frequency from first-principles dynamics.

Critical findings

• • Determined the intrinsic free oscillation rate of superoxide directly from real-time electronic propagation rather than inferred spectroscopy.
• • Demonstrated that real-time TD-DFT captures coherent electron density motion inaccessible to static DFT approaches.
• • Established a reproducible ab initio workflow for quantifying ultrafast radical dynamics without empirical parameterization.
• • Provided a quantum-dynamical framework extendable to reactive oxygen species and transient radical intermediates.