Schematic diagram of the control mechanism for DI channel. (a) The assemble of ionization processes is the coherent interference between the two independent wave packets excited by the former two ionizing pulses in the time domain. After a delay of T, the third sub-pulse arrives and leads to the dissociation (DI and CE). (b) The temporal separation between adjacent sub-pulses is determined by the parameter T. The difference of relative phases between adjacent sub-pulses is determined by Φ dif = Δ ω T .