Modelling of a linear ion trap operation in the second stability region

Abstract

Ion trajectory numerical simulation is used to find the linear ion trap excitation contour in the second stability region. The effects of initial conditions, the ejection Mathieu parameter, scan speed, dipole excitation voltage and gas damping are studied. Modeling shows that in the stability region center the resolution power is ≈200000 (at full width half height of a peak, FWHM) at pressure 0.1 mTorr and 100 % excitation efficiency (not taking into account the space charge).

Keywords

• Linear ion trap
• Dipolar excitation
• The second stability region
• Resolution
• Excitation time
• Excitation contour