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The Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) Laboratory is equipped with a NWR-193 (Ar-F) Excimer laser ablation system and a PerkinElmer NexION 2000 ICP-MS. The LA-ICP-MS is suitable for in situ analysis of trace elements and isotopic ratios in solid materials. The 193 nm excimer laser is equipped with “infinitely variable aperture” system that allows to focus the laser in spots as small as 2 µm, ablating very small volumes of samples (a few µm3). A constant flow of He transport the ablated material towards the ICP-MS, where particles are first ionized by a plasma and then analyzed by a mass spectrometer.