Ion trajectory simulations in a high-pressure cylindrical ion trap.

We present the simulation of a cylindrical ion trap (CIT) at high pressure (5–25 Torr range). SIMION 7.0 software was used for the simulations. The effect of pressure, RF frequency and trap dimensions has been investigated. The shape of stability diagrams at non-zero pressure is drastically different from the one observed in vacuum. Preliminary experimental results are shown, using a r=z= 3 mm-long CIT at 12 Torr for trapping peptide and protein ions.