Multichannel Contributions in Nonsequential Double Ionisation of $$\mathrm{{CO}}_2$$

Molecular orbital imprint in laser-driven electron recollision

“…The three steps consist of laser-driven tunnel ionization, propagation of the electron in the continuum, and interaction with the ion core upon recollision, all of which occur consecutively within a fraction of a laser cycle. While the first two steps are common to all recollision processes, the interaction step can take the form of radiative recombination in high harmonic generation (HHG) or of inelastic or elastic scattering, as is the case in nonsequential double ionization (3)(4)(5)(6) and laser-induced electron diffraction (LIED) (7)(8)(9)(10)(11)(12)(13)(14)(15). While many experimental observations to date were attributed to the molecular-frame angle dependence of the strong-field ionization (SFI) and the electron-ion interaction steps, one of the central assumptions underlying attosecond strong-field spectroscopies is that the propagation step is largely system-independent.…”