Abstract
Surprisingly large signals for direct double ionization of He by intense laser light have been observed in a series of recent experiments [1–6]. The most dramatic observation of this effect is in the latest experiment by Walker et. at. [6], who measured the double ionization signal over a remarkable range of twelve orders of magnitude covering an intensity domain between 1014 W/cm2 and 1016 W/cm2 at a wavelength of 780 nm. Perhaps the most unexpected aspect of this result is that the observed double ionization signal below the experimental ‘saturation intensity’ (i. e. the intensity at which the initially present neutral target atoms in the interaction volume is depleted) is several orders of magnitude greater than that expected for the single ionization of the already once ionized He atoms! The most interesting question is: what is the mechanism behind this anomalously large signal?
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© 1996 Plenum Press
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Faisal, F.H.M., Becker, A. (1996). ‘Intense-Field Many-Body S-Matrix Theory’ and Mechanism of Laser Induced Double Ionization of Helium. In: Campbell, D.M., Kleinpoppen, H. (eds) Selected Topics on Electron Physics. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0421-0_34
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DOI: https://doi.org/10.1007/978-1-4613-0421-0_34
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