242 research outputs found
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
Energy Sharing in the 2-Electron Attosecond Streak Camera
Using the recently developed concept of the 2-electron streak camera (see NJP
12, 103024 (2010)), we have studied the energy-sharing between the two ionizing
electrons in single-photon double ionization of He(1s2s). We find that the most
symmetric and asymmetric energy sharings correspond to different ionization
dynamics with the ion's Coulomb potential significantly influencing the latter.
This different dynamics for the two extreme energy sharings gives rise to
different patterns in asymptotic observables and different time-delays between
the emission of the two electrons. We show that the 2-electron streak camera
resolves the time-delays between the emission of the two electrons for
different energy sharings
Frustrated double ionization in two-electron triatomic molecules
Using a semiclassical model, we investigate frustrated double ionization (FDI) in D3
+, 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
Momentum space tomographic imaging of photoelectrons
We apply tomography, a general method for reconstructing 3-D distributions
from multiple projections, to reconstruct the momentum distribution of
electrons produced via strong field photoionization. The projections are
obtained by rotating the electron distribution via the polarization of the
ionizing laser beam and recording a momentum spectrum at each angle with a 2-D
velocity map imaging spectrometer. For linearly polarized light the tomographic
reconstruction agrees with the distribution obtained using an Abel inversion.
Electron tomography, which can be applied to any polarization, will simplify
the technology of electron imaging. The method can be directly generalized to
other charged particles.Comment: Accepted by J. Phys.
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