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Abstract:
Within this work, electron dynamics in atoms are experimentally and numerically investigated on their natural attosecond time scales. To access these dynamics, ultrashort and moderately intense few-cycle laser pulses are superposed with attosecond pulsed radiation in the extremeultraviolet spectral region In particular, a bound two-electron wave packet in helium on attosecond time scales was experimentally observed. A novel experiment is presented to simultaneously measure resonant photoabsorption spectra of laser-coupled doubly excited states in helium and the streaked photoelectron spectra. It provides the advantage of obtaining an absolute calibration of the time-delay zero for absorption spectra, where delay-dependent phase information is extracted.
