Journal
PHYSICAL REVIEW A
Volume 93, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.061402
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Funding
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Knut and Alice Wallenberg Foundation
- European Research Council (PALP)
- European COST Action [CM1204 XLIC]
- Joint Research Programme INREX of Laserlab-Europe III
- European Union [641789]
- [GOP-1.1.1.-12/B-2012-0001]
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We present a demonstration of two-photon double ionization of neon using an intense extreme ultraviolet (XUV) attosecond pulse train (APT) in a photon energy regime where both direct and sequential mechanisms are allowed. For an APT generated through high-order harmonic generation (HHG) in argon we achieve a total pulse energy close to 1 mu J, a central energy of 35 eV, and a total bandwidth of similar to 30 eV. The APT is focused by broadband optics in a neon gas target to an intensity of 3 x 10(12) Wcm(-2). By tuning the photon energy across the threshold for the sequential process the double ionization signal can be turned on and off, indicating that the two-photon double ionization predominantly occurs through a sequential process. The demonstrated performance opens up possibilities for future XUV-XUV pump-probe experiments with attosecond temporal resolution in a photon energy range where it is possible to unravel the dynamics behind direct versus sequential double ionization and the associated electron correlation effects.
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