ion yields (IMAGE)

Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI)

ion yields

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Fig. 2: Ar2+ and Ar3+ ion yields as a function of the time delay between two attosecond pulse trains. (a) The Ar2+ ion yield (red curve) is only weakly modulated as a function of the XUV-XUV time delay, whereas clear oscillations with a period of 1.3 fs are observed in the delay-dependent Ar3+ ion yield (blue curve). These results indicate that Ar2+ is generated via the sequential absorption of two photons. Subsequently, two additional photons are simultaneously absorbed to form Ar3+.

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