publication . Article . 1992

Observation of nonsequential double ionization of helium with optical tunneling

Fittinghoff, D. N.; Bolton, P. R.; Chang, B.; Kulander, K. C.;
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, Double ionization, Quantum tunnelling, Charged particle, Ionization, Physics, Helium, chemistry.chemical_element, chemistry, Photoionization, Atomic physics, Tunnel effect
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