Disentangling the resonant Auger spectra of ozone: overlapping core-hole states and core-excited state dynamics

We investigate the resonant and non-resonant Auger spectra of ozone with a newly implemented multi-reference protocol based on the one-center approximation [Tenorio et al., J. Chem. Theory Comput. 2022, 18, 4387-4407]. The results of our calculations are compared to existing experimental data, where we elucidate the resonant Auger spectrum measured at 530.8 and 536.7 eV, that correspond to the 1s_O → π*(2b₁) and 1s_O → σ*(7a₁) resonances, and at 542.3 eV, which lies near the 1s_O → σ*(7a₁) excited state and above the 1s_O^-1 ionization threshold. Using molecular dynamics simulations, we demonstrate the relevance of few-femtoseconds nuclear dynamics in the resonant Auger spectrum of ozone following the 1s_O → π*(2b₁) core-excitation.