Fig. 4: Resonant and non-resonant PDAs and photoionization delays.

Resonant (top) and non-resonant (bottom) PDA magnitudes (a, b), phases (c, d), and energy derivatives of the phases representing the time delays (e, f). The respective left (right) halves of the 2D maps show the data extracted from the experiment (theory). In the 2D polar plots, the radius indicates the photoelectron kinetic energy in eV, and the polar angle \({\theta }_{k}\) is relative to the molecular axis, with (\({\theta }_{k}=0^\circ\)) pointing to the direction of the N atom. Note that the non-resonant time delays are on a reduced scale compared to the resonant ones. For both the computed and experimental data, we obtain a very good fit of the PDAs for \({\theta }_{k}\) between 0° and 180°, at electron kinetic energies from 4.65 eV to 17.05 eV: this energy range includes the shape resonance in the c ³Π channel but excludes resonant contributions from other channels which strongly affect the PDAs below 4.65 eV. This supports the validity of the proposed multi-channel Fano model.