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We present and discuss in detail the design and characterization of a new linear quadrupole ion trap with additional ion ejection and acceleration electrodes that is coupled to a time-of-flight mass spectrometer. Mass spectra of Coulomb crystals consisting of Ca +,CaO + and CaOH + ions were recorded with a post-ejection-acceleration scheme yielding a mass resolution of m/Δm≈700. The second...