Abstract
A new experimental technique is described for probing the motion of ions in a quadrupole ion trap via the application of short dc pulses to one endcap electrode. The method, which arose from simulations conducted using a multi-ion simulation program, ITSIM, reveals details of the motion of trapped ions and allows experimental measurement of the ion secular frequency. It is shown that a short dc pulse having the appropriate phase relationship with respect to the phase of oscillation of a population of trapped ions may be used to activate and eject chosen species from the trap while leaving other ions, even isobaric ions, relatively unperturbed. This provides a possible basis for high resolution collisional activation and high resolution mass analysis in the Paul trap.
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