FT-ICR spectrometry with simultaneous trapping of positive and negative ions

Ion traps in modern mass spectrometry

“…67 The need for axially separated trapping regions in such a cell was recognized, and modified designs were suggested in subsequent work. 68 The electrical field and the ion motion in such ICR cells with double-well potentials were studied in detail, including predictions of exact frequencies for ions moving in differing radial and axial regions. Conditions for reactions between positive and negative ions were analyzed.…”

“…The electrical field and the ion motion in such ICR cells with double‐well potentials were studied in detail, including predictions of exact frequencies for ions moving in differing radial and axial regions. Conditions for reactions between positive and negative ions were analyzed . The observations are compatible with a later work showing that electron capture dissociation works best when the relative energy of electrons is sufficiently low in the reaction zone in an ICR cell with similar field geometry …”

“…Wang introduced an ICR cell with screens in front of the trapping electrodes of a cylindrical ICR cell, allowing simultaneous storage of positive and negative ions . The need for axially separated trapping regions in such a cell was recognized, and modified designs were suggested in subsequent work . The electrical field and the ion motion in such ICR cells with double‐well potentials were studied in detail, including predictions of exact frequencies for ions moving in differing radial and axial regions.…”

A novel high-performance Fourier transform ion cyclotron resonance cell for improved biopolymer characterization

“…Other trapping schemes, such as that employed with the single‐trap electrode cell,47 can also be employed, with the additional features promoted by the present design, including the facility for trapping well shape adjustment after ion trapping to allow more efficient detection. Additionally, ion–ion reactions between ions of like or opposite charge can be facilitated with this cell design, since the multiple trapping wells can be used to trap both positive and negative ions simultaneously 48. Finally, the present cell design will also make approaches involving gated trapping more effective, since a larger ion population can be effectively sampled with this longer cell than with conventional cells.…”

Characterization of a new open cylindrical ICR cell for ion–ion collision studies

“…Extending ICR capability to trap both ion polarities simultaneously was achieved by use of nested cells in a static electric field [14][15][16][17]. However, previous geometries of nested ICR cells, which are operated under double well potential configuration, provided a main central stability region for one ion polarity inside the detection region and two terminal ion stability regions for the other polarity outside and near the detection region.…”