(color online) Variation of the t– curve and the electron probability density on the detector with the oscillating electric field frequency. , φ = 0. The detector is localized at the point ρ = 0, a.u. The black line represents the down orbit and the red line denotes the up orbit. Panels (a), (c), (e), (g), (i), and (k) are the t– curves that the detached electron can reach the detector, while panels (b), (d), (f), (h), (j), and (l) are the corresponding electron probability densities on the detector. The oscillating electric field frequency is given in each plot.