A mass selective ion trapping device comprising: a linear ion trap including: a plurality of trap electrodes spaced apart from each other and surrounding a trap interior, the plurality of trap electrodes including a first pair of trap electrodes and a second pair of trap electrodes , at least a first trap electrode of the first pair of trap electrodes including a trap exit aperture , the trap electrodes configured for generating a quadrupolar trapping field in the trap interior and for mass selective ejection of ions from the trap interior; an RF control circuitry configured to: during a first period of time, apply a balanced AC voltage to the trap electrodes such that a first AC voltage applied to the first pair of trap electrodes is of opposite sign to a second AC voltage to the second pair of trap electrodes , the first and second AC voltages being of substantially the same magnitude, wherein the balanced AC voltage applied during the first period of time is in a frequency range of between about 100 kHz and about 600 kHz; during a second period of time, apply an RF voltage to the second pair of trap electrodes and hold the first pair of trap electrodes at a near 0 V potential, wherein the RF voltage is in a frequency range of between about 750 kHz and about 1500 kHz; during a transition period between the first period of time and the second period of time, ramp the balanced AC voltage down and synchronously ramp the RF voltage up while keeping the total trapping field strong enough to retain ions but not too strong to eject ions, wherein these two ramps start together; and eject ions from the linear ion trap after the second period of time. a linear ion trap including: a plurality of trap electrodes spaced apart from each other and surrounding a trap interior, the plurality of trap electrodes including a first pair of trap electrodes and a second pair of trap electrodes , at least a first trap electrode of the first pair of trap electrodes including a trap exit aperture , the trap electrodes configured for generating a quadrupolar trapping field in the trap interior and for mass selective ejection of ions from the trap interior; an RF control circuitry configured to: during a first period of time, apply a balanced AC voltage to the trap electrodes such that a first AC voltage applied to the first pair of trap electrodes is of opposite sign to a second AC voltage to the second pair of trap electrodes , the first and second AC voltages being of substantially the same magnitude, wherein the balanced AC voltage applied during the first period of time is in a frequency range of between about 100 kHz and about 600 kHz; during a second period of time, apply an RF voltage to the second pair of trap electrodes and hold the first pair of trap electrodes at a near 0 V potential, wherein the RF voltage is in a frequency range of between about 750 kHz and about 1500 kHz; during a transition period between the first period of time and the second period of time, ramp the balanced AC voltage down and synchronously ramp the RF voltage up while keeping the total trapping field strong enough to retain ions but not too strong to eject ions, wherein these two ramps start together; and eject ions from the linear ion trap after the second period of time. during a second period of time, apply an RF voltage to the second pair of trap electrodes and hold the first pair of trap electrodes at a near 0 V potential, wherein the RF voltage is in a frequency range of between about 750 kHz and about 1500 kHz; during a transition period between the first period of time and the second period of time, ramp the balanced AC voltage down and synchronously ramp the RF voltage up while keeping the total trapping field strong enough to retain ions but not too strong to eject ions, wherein these two ramps start together; and eject ions from the linear ion trap after the second period of time. <EOS>