A parallel magnetic sector mass analyzer design

Abstract

This paper presents a parallel magnetic sector mass analyzer design in which ions are simultaneously detected on a flat horizontal plane for a mass range of 1260 amu. Simulation results predict that second-order focusing can be achieved for several regions in the detected mass spectrum. The analyzer is predicted to have an average mass resolution limited by spherical aberration of 611 for an input angular spread of ±25 mrad along its intrinsic focal plane, which when projected on a horizontal detector plane, drops to 371. For energy dispersion correction via the use of an electric sector, the average predicted mass resolution limited by spherical aberration (±25 mrad angular spread) on the horizontal detector plane is 415. The predicted mass resolution limited by chromatic aberration is 592 where the energy spread is ±60 eV around an emission energy of 2 keV (±3%). A model based upon the magnetic scalar potential model is first used, and later checked by simulation that takes into account the effects of magnetic saturation. © 2010 Elsevier B.V. Allrights reserved.