The inherently two-dimensional nature of the hydrodynamic expansion of large xenon clusters irradiated by intense laser fields is shown in measurements of ion and electron emission as a function of laser pulse duration. These reveal correlation between a resonance in energy absorption by the clusters and asymmetry in cluster expansion. An extension of the hydrodynamic model accounts for the observations; an earlier interpretation of the electron spectrum is found to be incorrect.
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Kumarappan et al. (2002) studied this question.
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