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We investigate laser-induced nonsequential double ionization from aligneddiatomic molecules, using the strong-field approximation in its length andvelocity gauge formulations. Throughout, we consider that the first electrondislodges the second by electron-impact ionization. Employing modifiedsaddle-point equations, we single out the contributions of different scatteringscenarios to the maxima and minima observed in the differential electronmomentum distributions. We show that the quantum interference between theelectron orbits starting and ending at a specific center $C_{j}$%, and thosestarting at $C_{j}$ and ending at a different center $C_{\nu}$ leads to thesame maxima as minima as if all possible scenarios are taken. There exist,however, quantitative differences as far as the gauge choice is concerned.Indeed, while the velocity-gauge distributions obtained employing only theabove-mentioned processes are practically identical to the overalldistributions, their length-gauge counterparts exhibit an asymmetry in thepositive and negative momentum regions. This asymmetry is due to additionalpotential-energy shifts which are only present in the length-gauge formulation,and which, depending on the center, sink or increase the potential barrierthrough which the first electron tunnels. In contrast, the interference betweentopologically similar scenarios leads at most to patterns whose positions, inmomentum space, do not agree with the overall interference condition, neitherin the length nor in the velocity gauge.

Laser-induced nonsequential double ionization in diatomic molecules: one and two-center rescattering scenarios