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arXiv · 1603.05439

Two-photon double ionization of neon using an intense attosecond pulse train

B. Manschwetus·L. Rading·F. Campi·S. Maclot·H. Coudert-Alteirac·J. Lahl·H. Wikmark·P. Rudawski·C. M. Heyl·B. Farkas·T. Mohamed·A. L'Huillier·P. Johnsson
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Abstract

We present the first 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 $μ$J, a central energy of 35 eV and a total bandwidth of $\sim30$ eV. The APT is focused by broadband optics in a neon gas target to an intensity of $3\cdot10^{12} $W$\cdot$cm$^{-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 vs. sequential double ionization and the associated electron correlation effects.

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B. Manschwetus, L. Rading, F. Campi, S. Maclot, H. Coudert-Alteirac, J. Lahl, H. Wikmark, P. Rudawski, C. M. Heyl, B. Farkas, T. Mohamed, A. L'Huillier, P. Johnsson. 2016-03-17. Two-photon double ionization of neon using an intense attosecond pulse train. https://doi.org/10.1103/physreva.93.061402

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