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Energy spectra and angular distributions have been measured of electrons thatare emitted upon disassembly of $Xe_{150000}$ following irradiation by intense(10$^{15}-10^{16}$ W cm$^{-2}$) laser pulses whose durations are varied overthe 100-2200 fs range. The cluster explosion dynamics occur in the hydrodynamicregime. Electron emission is found to be unexpectedly asymmetric and exhibits aresonance when the laser pulse duration is $\sim$1 ps. These results arerationalized by extending the hydrodynamic model to also take into account theforce that the light field exerts on the polarization charge that is induced onsurface of the cluster. We show that the magnitude of this electrostrictiveforce is comparable to those of Coulombic and the hydrodynamic forces, and itexhibits resonance behavior. Contrary to earlier understanding, we find thatlow-energy electrons are connected to the resonance in energy absorption by thecluster. The high-energy electrons seem to be produced by a mechanism that isnot so strongly influenced by the resonance.Comment: 1 Revtex file, 8 figs. in eps forma

Asymmetric emission of high-energy electrons in the two-dimensional hydrodynamic expansion of large xenon clusters irradiated by intense laser fields