Single and multiple electron dynamics in the strong field limit

Abstract

Abstract.High precision photoelectron energy and angular distributions in helium and neon atoms for a broad intensity range reflect the change in the continuum dynamics that occurs as the ionization process evolves into the pure tunneling regime. Elastic rescattering of the laser-driven free electron from its parent ion core leaves a distinct signature on the spectra, providing a direct quantitative test of the various theories of strong field multiphoton ionization. We show that it takes a relatively complete semi-classical rescattering model to accurately reproduce the observed photoelectron distributions. However, the calculated inelastic rescattering rate fails to reproduce the measured nonsequential double ionization yields.,,

Can harmonic generation cause non-sequential ionization?

“…At this point we emphasize that this description of the double ionization is entirely consistent with the recollision picture-it is well established that the harmonic generation is due to the return of a continuum wavepacket. However, previous rescattering models show a strong disagreement with the experimental results, clearly underestimating the measured ratio between single ionization and double non-sequential ionization [23]. In fact, in the rescattering models proposed so far [24,25] the NSDI yield is calculated assuming a fieldfree cross section obtained by considering an electron scattering off a singly ionized helium ion.…”