Anisotropy parameters in two-color two-photon above-threshold ionization

Anisotropy parameters in two-color two-photon above-threshold ionization

Angular anisotropy parameters and recoil-ion momentum distribution in two-photon double ionization of helium

We present convergent-close-coupling CCC calculations of the angular anisotropy parameters 2 , 4 and the recoil ion momentum distribution d /dp in two-photon double ionization TPDI of helium. In a stark contrast to single-photon double ionization SPDI , where the 2 parameter varies widely changing the angular distribution from isotropic to nearly dipole for slow and fast photoelectrons, respect...

Angular anisotropy parameters for sequential two-photon double ionization of helium

We evaluate photoelectron angular anisotropy parameters for the process of sequential two-photon double electron ionization of helium within the lowest-order time-independent perturbation theory. Our results indicate that for photoelectron energies outside the interval Eslow,Efast , where Eslow= −VHe+ and Efast= −VHe, there is a considerable deviation from the dipole angular distribution, thus ...

Time delays in two-photon ionization.

We present results of ab initio numerical simulations of time delays in two-photon ionization of the helium atom using the attosecond streaking technique. The temporal shifts in the streaking traces consist of two contributions, namely, a time delay acquired during the absorption of the two photons from the extreme-ultraviolet field and a time delay accumulated by the photoelectron after photoa...

Two-source double-slit interference in angle-resolved high-energy above-threshold ionization spectra of diatoms.

When an electron from a diatomic molecule undergoes tunneling-rescattering ionization, a novel form of destructive interference can be realized that involves all four geometric orbits that are available to the electron when it is freed, because both ionization and rescattering may take place at the same or at different centers. We find experimentally and confirm theoretically that in orientatio...