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Abstract

In this work, the photoionization dynamics of atomic krypton, argon dimers and molecular nitrogen are investigated through a series of experiments with attosec- ond time resolution. The attosecond time resolution is provided by a measure- ment technique that uses a train of extreme-ultraviolet pulses. These experi- ments were performed with a high-repetition rate (50 KHz, 75KHz, 150 KHz) attosecond beamline and a 3-Dimensional Ion/electron momentum imaging de- vice known as a Reaction Microscope (REMI). Using the high-repetition rate laser along with the coincidence detection capabilities of the REMI, several intrigu- ing phenomena associated with atomic and molecular photoionization have been studied. These include the role of spin-orbit interactions in atomic photoioniza- tion, the influence of Van der Waals forces on the photoionization of argon dimers and finally various dissociation processes in molecular nitrogen.