302 research outputs found
Attosecond time-scale multi-electron collisions in the Coulomb four-body problem: traces in classical probability densities
In the triple ionization of the Li ground state by single photon absorption
the three electrons escape to the continuum mainly through two collision
sequences with individual collisions separated by time intervals on the
attosecond scale. We investigate the traces of these two collision sequences in
the classical probability densities. We show that each collision sequence has
characteristic phase space properties which distinguish it from the other.
Classical probability densities are the closest analog to quantum mechanical
densities allowing our results to be directly compared to quantum mechanical
results.Comment: 9 pages, 10 figure
Controlling electron-electron correlation in frustrated double ionization of molecules with orthogonally polarized two-color laser fields
We demonstrate the control of electron-electron correlation in frustrated
double ionization (FDI) of the two-electron triatomic molecule D when
driven by two orthogonally polarized two-color laser fields. We employ a
three-dimensional semi-classical model that fully accounts for the electron and
nuclear motion in strong fields. We analyze the FDI probability and the
distribution of the momentum of the escaping electron along the polarization
direction of the longer wavelength and more intense laser field. These
observables when considered in conjunction bear clear signatures of the
prevalence or absence of electron-electron correlation in FDI, depending on the
time-delay between the two laser pulses. We find that D is a better
candidate compared to H for demonstrating also experimentally that
electron-electron correlation indeed underlies FDI.Comment: 5 pages, 4 figure
Frustrated double ionization in two-electron triatomic molecules
Using a semi-classical model, we investigate frustrated double ionization
(FDI) in , a two-electron triatomic molecule, when driven by an
intense, linearly polarized, near-infrared (800 nm) laser field. We compute the
kinetic energy release of the nuclei and find a good agreement between
experiment and our model. We explore the two pathways of FDI and show that,
with increasing field strength, over-the-barrier ionization overtakes tunnel
ionization as the underlying mechanism of FDI. Moreover, we compute the angular
distribution of the ion fragments for FDI and identify a feature that can
potentially be observed experimentally and is a signature of only one of the
two pathways of FDI.Comment: 5 pages, 4 figure
Intertwined electron-nuclear motion in frustrated double ionization in driven heteronuclear molecules
We study frustrated double ionization in a strongly-driven heteronuclear
molecule HeH and compare with H. We compute the probability
distribution of the sum of the final kinetic energies of the nuclei for
strongly-driven HeH. We find that this distribution has more than one
peak for strongly-driven HeH, a feature we do not find to be present for
strongly-driven H. Moreover, we compute the probability distribution of
the n quantum number of frustrated double ionization. We find that this
distribution has several peaks for strongly-driven HeH, while the
respective distribution has one main peak and a "shoulder" at lower n quantum
numbers for strongly-driven H. Surprisingly, we find this feature to be a
clear signature of the intertwined electron-nuclear motion
- …