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Open Access Publications from the University of California

Selectivity of Electronic Coherence and Attosecond Ionization Delays in Strong-Field Double Ionization

  • Author(s): Kobayashi, Y
  • Reduzzi, M
  • Chang, KF
  • Timmers, H
  • Neumark, DM
  • Leone, SR
  • et al.

© 2018 American Physical Society. Experiments are presented on real-time probing of coherent electron dynamics in xenon initiated by strong-field double ionization. Attosecond transient absorption measurements allow for characterization of electronic coherences as well as relative ionization timings in multiple electronic states of Xe+ and Xe2+. A high degree of coherence g=0.4 is observed between P320-P300 of Xe2+, whereas for other possible pairs of states the coherences are below the detection limits of the experiments. A comparison of the experimental results with numerical simulations based on an uncorrelated electron-emission model shows that the coherences produced by strong-field double ionization are more selective than predicted. Surprisingly short ionization time delays, 0.85 fs, 0.64 fs, and 0.75 fs relative to Xe+ formation, are also measured for the P23, P03, and P13 states of Xe2+, respectively. Both the unpredicted selectivity in the formation of coherence and the subfemtosecond time delays of specific states provide new insight into correlated electron dynamics in strong-field double ionization.

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