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An intense isotropic source of multicharged carbon and oxygen ions with energy above 300 keV and particle number 108 per shot was obtained by femtosecond Ti:Sa laser irradiation of submicron clusters. The source was employed for high-contrast contact ionography images with 600 nm spatial resolution. A variation in object thickness of 100 nm was well resolved for both Zr and polymer foils.
Faenov et al. (Mon,) studied this question.
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