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High resolution mass spectrometry is a key technology for in-depth protein characterization. High-field Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enables high-level interrogation of intact proteins in the most detail to date. However, an appropriate complement of fragmentation technologies must be paired with FTMS to provide comprehensive sequence coverage, as well as...
Simultaneous trapping of positive and negative ions in a cylindrical ICR cell is achieved with double trapping electrodes, each built out of a solid plate electrode and a grid. An approximation is used to describe the electrodes analytically. Using this approximation, the electric potential inside the ICR cell is calculated by a Fourier-Bessel series expansion. The sites and trajectories of ions...
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