Attosecond photoionization dynamics in neon

Decoherence in attosecond photoionization.

The creation of superpositions of hole states via single-photon ionization using attosecond extreme-ultraviolet pulses is studied with the time-dependent configuration-interaction singles (TDCIS) method. Specifically, the degree of coherence between hole states in atomic xenon is investigated. We find that interchannel coupling not only affects the hole populations, but it also enhances the ent...

Attosecond control in photoionization of hydrogen molecules.

We report experiments where hydrogen molecules were dissociatively ionized by an attosecond pulse train in the presence of a near-infrared field. Fragment ion yields from distinguishable ionization channels oscillate with a period that is half the optical cycle of the IR field. For molecules aligned parallel to the laser polarization axis, the oscillations are reproduced in two-electron quantum...

Perturbation theory analysis of attosecond photoionization

Numerical Simulations of Attosecond Streaking Time Delays in Photoionization

We present results of numerical simulations and theoretical classical analysis of time delays with respect to the instant of ionization in a numerical streaking experiment. These results confirm our previous interpretation of the streaking time delay as a finite-range and fieldweighted time delay. We show that in the streaking experiments the time delay strongly depends on the parameters of the...

Electron Interference in Molecular Circular Polarization Attosecond XUV Photoionization

Two-center electron interference in molecular attosecond photoionization processes is investigated from numerical solutions of time-dependent Schrödinger equations. Both symmetric H2 and nonsymmetric HHe 2+ one electron diatomic systems are ionized by intense attosecond circularly polarized XUV laser pulses. Photoionization of these molecular ions shows signature of interference with double pea...