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Abstract

Within this work, electron dynamics inside argon atoms are observed by probing the autoionizing states of argon atoms, so-called window resonances, with both attosecond XUV and timed-delayed few-cycle femtosecond NIR laser pulses, using attosecond transient absorption spectroscopy. The window resonances in the energy region of 25 - 29.3 eV are first excited with the XUV pulse and then dressed by the NIR laser, where the natural decay process of the states is greatly affected by the strong-field of the NIR pulse. Preliminary results of the measurement are presented in this work, with a hypothetical description of some of the effects that are present. A comparison has been made with the experimental results from a paper publishing measurements of autoionizing states with attosecond transient absorption spectroscopy for the first time, where the same resonances were probed. The comparison is only partly possible due to different experimental parameters and conditions, where more pronounced and new effects have been observed in the here performed measurement.