Attosecond electro-nuclear dynamics of H2 double ionization
Abstract
The ultrafast electronic and nuclear dynamics of H2 laser-induced double ionization is studied using a time-dependent wave packet approach that goes beyond the fixed nuclei approximation. The different double ionization pathways are analyzed by following the evolution of the total wave function during and after the pulse. We show that the rescattering of the first ionized electron produces a coherent superposition of excited molecular states which presents a pronounced transient ionic character. This attosecond excitation is followed by field-induced double ionization and by the formation of short-lived autoionizing states which decay via double ionization. These two different double ionization mechanisms may be identified by their signature imprinted in the kinetic-energy distribution of the ejected protons.
Domains
Quantum Physics [quant-ph]
Origin : Files produced by the author(s)