“…In this case, the third step can explain the appearance of the plateau in AT1 with its cutoff at IOUp [13]. The classical three-step model is consistent with results of quantum-mechanical calculations [14-201. Although we use the 3-step physical model to interpret our results, all of our results are obtained from quantum-mechanical calculations, as described in detail elsewhere [4,5,. In brief, we solve the three-dimensional, time-dependent Schrodinger equation for an electron moving in the laser plus static field(s).…”