A system for coherently exciting and ejecting ions for destructive Fourier transform mass spectrometry, FTMS, mass analysis using a linear ion trap, LIT, quadrupole, comprising: a quadrupole that includes quadrupole rods that have an entrance end for receiving ions and an exit end for ejecting ions, a collar electrode surrounding a central portion of the quadrupole rods, and a plurality of linear accelerator, Linac, electrodes located between the collar electrode and the exit end; an exit lens (240, 340) located coaxially with the quadrupole rods near the exit end of the quadrupole rods; a destructive detector (250, 360) located coaxially with the exit lens (240, 340) and located on the other side of the exit lens; and a processor in communication with the quadrupole, the exit lens (240, 340), and the destructive detector (250, 360) that is configured to: in order to fill the quadrupole with ions and cool the ions once filled, apply a pressure and gas flow within the quadrupole by controlling gas inlets and outlets of the quadrupole; in order to trap the ions in the quadrupole during the filling and cooling, apply a direct current, DC, voltage and a radio frequency, RF, voltage to the quadrupole rods, a DC Linac voltage to the plurality of Linac electrodes, a first attractive DC collar voltage to the collar electrode, and a first repulsive DC exit lens voltage and an RF voltage to the exit lens (240, 340), in order to coherently oscillate the ions after the filling and cooling, apply a coherent excitation between at least two rods of the quadrupole rods, and in order to axially eject the coherently oscillating ions through the exit lens (240, 340) and to the destructive detector (250, 360) for detection after the coherent excitation is applied, change the first repulsive DC exit lens voltage of the exit lens (240, 340) to a second attractive DC exit lens voltage, and change the first attractive DC collar voltage of the collar electrode to a second attractive DC collar voltage that is less attractive to the coherently oscillating ions than the first attractive DC collar voltage but more attractive to the coherently oscillating ions than the second attractive DC exit lens voltage. a quadrupole that includes quadrupole rods that have an entrance end for receiving ions and an exit end for ejecting ions, a collar electrode surrounding a central portion of the quadrupole rods, and a plurality of linear accelerator, Linac, electrodes located between the collar electrode and the exit end; an exit lens (240, 340) located coaxially with the quadrupole rods near the exit end of the quadrupole rods; a destructive detector (250, 360) located coaxially with the exit lens (240, 340) and located on the other side of the exit lens; and a processor in communication with the quadrupole, the exit lens (240, 340), and the destructive detector (250, 360) that is configured to: in order to fill the quadrupole with ions and cool the ions once filled, apply a pressure and gas flow within the quadrupole by controlling gas inlets and outlets of the quadrupole; in order to trap the ions in the quadrupole during the filling and cooling, apply a direct current, DC, voltage and a radio frequency, RF, voltage to the quadrupole rods, a DC Linac voltage to the plurality of Linac electrodes, a first attractive DC collar voltage to the collar electrode, and a first repulsive DC exit lens voltage and an RF voltage to the exit lens (240, 340), in order to coherently oscillate the ions after the filling and cooling, apply a coherent excitation between at least two rods of the quadrupole rods, and in order to axially eject the coherently oscillating ions through the exit lens (240, 340) and to the destructive detector (250, 360) for detection after the coherent excitation is applied, change the first repulsive DC exit lens voltage of the exit lens (240, 340) to a second attractive DC exit lens voltage, and change the first attractive DC collar voltage of the collar electrode to a second attractive DC collar voltage that is less attractive to the coherently oscillating ions than the first attractive DC collar voltage but more attractive to the coherently oscillating ions than the second attractive DC exit lens voltage. in order to fill the quadrupole with ions and cool the ions once filled, apply a pressure and gas flow within the quadrupole by controlling gas inlets and outlets of the quadrupole; in order to trap the ions in the quadrupole during the filling and cooling, apply a direct current, DC, voltage and a radio frequency, RF, voltage to the quadrupole rods, a DC Linac voltage to the plurality of Linac electrodes, a first attractive DC collar voltage to the collar electrode, and a first repulsive DC exit lens voltage and an RF voltage to the exit lens (240, 340), in order to coherently oscillate the ions after the filling and cooling, apply a coherent excitation between at least two rods of the quadrupole rods, and in order to axially eject the coherently oscillating ions through the exit lens (240, 340) and to the destructive detector (250, 360) for detection after the coherent excitation is applied, change the first repulsive DC exit lens voltage of the exit lens (240, 340) to a second attractive DC exit lens voltage, and change the first attractive DC collar voltage of the collar electrode to a second attractive DC collar voltage that is less attractive to the coherently oscillating ions than the first attractive DC collar voltage but more attractive to the coherently oscillating ions than the second attractive DC exit lens voltage.