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The experimental data of the submicron periodic structures that are due to the laser radiation in air in a liquid medium (distilled water) on the surface of the polycrystalline nickel formed have been presented. By the electron microscopy methods the geometry of the formed surface structures has been defined: under irradiation in the air the structure is formed above the sample main surface, and under irradiation in liquid - below. The size of the pure nickel nanoparticles, produced by laser ablation formed by laser ablation of the nickel sample in liquid, has been measured.

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