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Representative negative ion mode single event ToF-SIMS spectra for 130 keV Au3+1, 130 keV Au9+1 and 520 keV Au400+4 projectiles on a native rat brain section from the same 100×100 μm2 field of view. All spectra are normalized to the number of impacts (typically 106 impacts). Notice the increase in molecular ion emission for the massive cluster projectile.
