Phys. Rev. Lett. 84, 443–446 (2000)Recoil-Ion Momentum Distributions for Single and Double Ionization of Helium in Strong Laser FieldsReceived 20 August 1999; published in the issue dated 17 January 2000 We have measured the momentum distributions of singly and doubly charged helium ions created in the focus of 220 fs, 800 nm laser pulses at intensities of (2.9–6.6)×1014W/cm2. All ions are emitted strongly aligned along the direction of polarization of the light. We find the typical momenta of the He2+ ions to be 5–10 times larger than those of the He1+ ions and a two peak structure at the highest intensity. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.443
DOI:
10.1103/PhysRevLett.84.443
PACS:
32.80.Rm, 31.90.+s, 32.80.Fb
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