Fig. 2: Angular offsets of electrons from different ATI orders.

The measured (black dots with errorbar) and calculated (curves) angular distributions for ATI rings with different electron energies of (a) 4.05 eV, (b) 5.6 eV, (c) 7.15 eV, (d) 8.7 eV and (e) 10.25 eV. The offsets of the MPEAs from the experimental measurement (shaded areas) and those calculated from TDSE and ICCSFA simulations demonstrate a quantitative agreement, which shows clear angle shifts relative to the CCSFA calculations without the sub-barrier potential interaction