Attosecond science is nowadays a well-established research field, which offers formidable tools for the investigation and control of electronic processes. In the last few years, attosecond pulses have been used to measure ultrafast electron dynamics in molecules. Sub-femtosecond electron localization after attosecond excitation has been observed in H_2 molecules [1]; control of photo-ionization of H_2 and O_2 molecules has been achieved by using attosecond pulse trains [2,3]. I will present the investigation of ultrafast electron dynamics in N_2 molecules and in a biomolecular building block, the amino acid phenylalanine, using attosecond pulses.
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