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Intense 3-cycle pulses (10 fs) of 800 nm laser light are utilized to measureenergy distributions of ions emitted following Coulomb explosion of Ar$_n$clusters ($n$=400-900) upon their irradiation by peak intensitis of5$\times$10$^{14}$ W cm$^{-2}$. The 3-cycle pulses do not afford the clustersufficient time to undergo Coulomb-driven expansion, resulting in overalldynamics that appear to be very different to those in the many-pulse regime.The peak ion energies are much lower than those obtained when 100 fs pulses ofthe same intensity are used; they are almost independent of the size of thecluster (over the range 400-900 atoms). Ion yields are a factor of 20 larger inthe direction that is perpendicular to the laser polarization vector than alongit. This unexpected anisotropy is qualitatively rationalized using moleculardynamics calculations in terms of shielding by an electronic charge cloudwithin the cluster that is spatially asymmetric.

Strong-field ionization and fragmentation of large, gas-phase clusters in the few-cycle domain