Cross section from PES

Schematic cross sections for photodissociation and their associated dynamical pathway (arrows) through ground and excited state potential-energy curves. For polyatomic molecules these curves represent a cross section through a multidimensional energy surface. We note that the integrated values of the various cross sections may be similar, leading to orders-or-magnitude greater peak magnitudes for indirect mechanisms. Taken from A. N. Heays et al. A&A 2017

Using complex scaling

llustration of the complex scaling transformation of a many-body Hamiltonian. Bound states and many-body thresholds are invariant. Resonant eigenval- ues correspond to poles of the resolvent or the S-matrix, are “hidden” on a sheet with ϑ = 0 (a), but are exposed if the cuts associated with many-body continua are rotated (b) Taken from A.T. Kruppa et al. Physical Review C · October 203

Lifetimes of ions and radicals

Lowest-lying doublet potential energy curves of NO2+. The B 2Σ+ state dissociation limit is0.42 eV, and that of the X 2Σ+ and A 2Π states is –3.96 eV, where zero is defined as v=0 of X 2Σ+. The arrows represent X 2Σ+→X 2Σ+ (navy) and X 2Σ+→B 2Σ+ (red) multipho- ton transitions, both starting from v=1, whose schematic vi- brational wave function is shown in orange. The navy and red hatched areas represent the vibrational continua of the X 2Σ+ and B 2Σ+ states, respectively. The schematic peaks with the corresponding colors on the right-hand side represent KER distributions for these bound–free pathways. The X 2Σ+ per- manent dipole moment and X 2Σ+–B 2Σ+ transition dipole moment are shown in the inset. (b) Franck-Condon (FC) population for the X 2Σ+ state of NO2+ resulting from NO → NO2+ vertical electron impact ionization in the ion source followed by predissociation in flight to the interaction region