Extending the Capacity in Modern Spherical High Capacity Ion Traps (HCT)

Technical Note

Expression Proteomics, Metabolomics Studies, Food & Environmental, Gen. Pharma & Chemistry

TN-24

Ion Trap

2008

Desmond Kaplan, Andreas Brekenfeld, Ralf Hartmer, Thorsten Ledertheil, Christoph Gebhardt, Michael Schubert Bruker Daltonics

Bruker Daltonics Technical Note TN-24

Abstract

During the last decade, RF ion traps have become a workhorse
of the analytical laboratory [1]. The ion capacity is a
key factor affecting ion trap performance. Recently, substantial
increases to the ion capacity have been achieved
through the introduction of two novel instruments: linear
ion traps [2] and high capacity spherical traps (HCT) [3].
The HCT uses phase-coupled excitation at a non-linear
resonance [4] resulting from the optimized high-order fields
(HOF) introduced by the new HCT geometry. The rationale
behind the increased ion capacity of the linear trap seems
to be well understood; however, the mechanisms for the
increased ion capacity of the HCT still requires a more
detailed explanation. This technical note will analyze and
describe the mechanisms for increasing the ion capacity in
a spherical high capacity trap.

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