title: Trajectory compensation in an autoresonant trap mass spectrometer.
abstract: The auto-resonant trap mass spectrometer, ART-MS, utilizes electrostatic ion trapping within an anharmonic potential well. Ions are detected after mass selective trap ejection with auto-resonant driving employing only low-power rf electronics. We identify the major limiting factor in the mass resolution of these instruments. Whilst keeping in the spirit of maintaining a rapid scan rate, low cost, lightweight instrument, with minimal required machining tolerances, we introduce a method for much improving the mass resolutions of an ART-MS. The addition of two electrodes has enabled an improvement in the mass resolution by a factor of ∼4. The scheme significantly reduces the effects of a finite sized trap and compensates for the influence of radial variation in natural oscillating frequencies within the trap. Compensation can be implemented with a wide range of designs and is not limited by the size of the trap.
authors: Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA.
authors: A V
authors: AV
authors: Ermakov
authors: B J
authors: BJ
authors: Hinch