We present a new multiply pulsed collision-gas technique forion axialization for Fourier-transform ion cyclotron resonace (FTICR) high-resolution mass analysis. Ions are axialized in the source trap of a dural-trap FTICR spectrometer y aimuthal quadrupolar irradiation for several tens of seconds at a steady-state pressure maintained y repeated pulses of coolision gas (argon), folowed by removal of the collision gas and detection at a much lower pressure after transfer to the analyzer trap. Magnitufe-mode FTICR mass resolving power, m/Δm≈1770000, for [M + K]+ ions from laser-desorbed/ionized leucne enkephalin at m/z 594 is demonstrated. This resolving power is the highest yet reported for a peptide with any type of laser desorption/ionization mass analyzer.
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