Interference between photoelectron wave packets (in momentum space) produced in the ionization of a helium atom by a pair of oppositely circularly polarized attosecond laser pulses that are time delayed.
From the article:
Electron Vortices in Photoionization by Circularly Polarized Attosecond PulsesJ. M. Ngoko Djiokap, S. X. Hu, L. B. Madsen, N. L. Manakov, A. V. Meremianin, and Anthony F. Starace
Phys. Rev. Lett. 115, 113004 (2015)
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