Non-sequential multiple ionization: signature of single-recollision pathway

We present the result of inclusive classical calculations of non-sequential multiple ionization (NSMI) in 780nm laser pulses with intensities above 10$^{14}$ W/cm$^{2}$.~ Using a large ensemble of four-electron trajectories, we obtain the end-of-pulse momentum distributions of ions for the processes of double, triple and quadruple ionization.~ These calculated distributions agree very well with the observed momentum distributions of Ne$^{2+}$, Ne$^{3+}$ and Ne$^{4+}$. Our analysis shows that a double-peak structure in the end-of-pulse momentum distribution of multiply charged ions can be regarded as the signature of NSMI via a single recollision.