As shown in FIGS. 10A and 10B, the analysis system 100 can include a spectrometer 10 with a function generator 82 to provide a low voltage axial RF input 82i to the mass analyzer (e.g., ion trap) 30 during mass scan for resonance ejection. The low voltage axial RF can be between about 100 mVpp to about 12,000 mVpp, typically between 100 to 10,000 mVpp. The axial RF can be applied to an end cap 31 or 32, typically end cap 31, or between the two end caps 31 and 32 during a mass scan for facilitating resonance ejection. An RF power source 88 provides an input signal to the ring electrode 33. The RF source 88 can include an RF signal generator 88g, RF amplifier 88p, and RF power amplifier 88a. The controller 100c can have a control circuit with an optional RF monitor. Some or all of these components can be held on a circuit board in the housing 10h enclosing the mass analyzer 30 in the chamber 12. In some embodiments, an amplitude ramp waveform can be provided as an input to the RF signal generator to modulate the RF amplitude. The low voltage RF can be amplified by a RF preamplifier then a power amplifier to produce a desired RF signal. The RF signal can be between about 1 MHz to 10 GHz or 1 MHz to 1000 MHz, depending on the size of the ring electrode features. As is well known to those of skill in the art, the RF frequency depends reciprocally on the ring electrode radius, r0. A typical RF frequency for an r0 of 500 μm would be 5-20 MHz. The voltages can be between 50 V0p to about 1500 V0p, typically up to about 500 V0p (as is well known to those of skill the “0p” subscript refers to zero-to-half peak).
