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We present measured and calculated energy-resolved photoelectron spectra obtained through two-photon ionization of He induced by a superposition from the 9th to the 15th harmonic of a Ti:Sapph laser forming an attosecond (asec) pulse train. The reported measured spectra are a decisive step towards frequency-resolved two-XUV-photon ionization-based second-order autocorrelation (AC) of asec pulse trains, and thus towards a complete reconstruction of asec pulses.

Frequency-resolved photoelectron spectra of two-photon ionization of He by an attosecond pulse train