Attosecond ionization and tunneling delay time measurements in helium.

  title={Attosecond ionization and tunneling delay time measurements in helium.},
  author={Petrissa Eckle and Adrian N. Pfeiffer and C Cirelli and Andr{\'e} Staudte and R D{\"o}rner and H. G. Muller and Markus B{\"u}ttiker and Ursula Keller},
  volume={322 5907},
It is well established that electrons can escape from atoms through tunneling under the influence of strong laser fields, but the timing of the process has been controversial and far too rapid to probe in detail. We used attosecond angular streaking to place an upper limit of 34 attoseconds and an intensity-averaged upper limit of 12 attoseconds on the tunneling delay time in strong field ionization of a helium atom. The ionization field derives from 5.5-femtosecond-long near-infrared laser… CONTINUE READING
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