publication . Article . 1992

Observation of nonsequential double ionization of helium with optical tunneling

David N. Fittinghoff; Paul Robert Bolton; Britton Chang; Kenneth C. Kulander;
Open Access
  • Published: 02 Nov 1992
Abstract
We have measured the ion yields for helium ionized by 120 fs, 614 nm laser pulses for intensities near ${10}^{16}$ W/${\mathrm{cm}}^{2}$. We have found that for these ultrashort pulses the ${\mathrm{He}}^{+2}$ data exhibit a feature which saturates in parallel with the ${\mathrm{He}}^{+}$ signal indicating that the ionization may proceed nonsequentially. We propose a new mechanism, which can exist only in the tunneling regime, for such nonsequential ionization.
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Subjects
arXiv: Physics::Atomic Physics Physics::Atomic and Molecular Clusters
free text keywords: General Physics and Astronomy, Ion, Physics, Tunnel effect, Charged particle, Quantum tunnelling, Double ionization, Atomic physics, Helium, chemistry.chemical_element, chemistry, Ionization, Photoionization
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