Field Optimization in a Segmented-Electrode Orbitrap.

Area of Science:

• Analytical Chemistry
• Physical Chemistry
• Instrumental Analysis

Background:

• Traditional spindle-shaped Orbitraps present manufacturing challenges.
• Segmented-electrode Orbitraps offer a more manufacturable design.
• Imperfect potential fields in Orbitraps limit mass resolution.

Purpose of the Study:

• To present an optimization method for the imperfect potential field of a segmented-electrode Orbitrap.
• To analyze the impact of potential field imperfections on ion trajectories and mass resolution.
• To demonstrate the achievement of ultrahigh mass resolution through field optimization.

Main Methods:

• Numerical simulations using the finite element method.
• Analysis of ion trajectories and frequency shifts.
• Optimization of electrode potentials to cancel harmonic field errors.

Main Results:

• Achieved mass resolution exceeding 200,000.
• Demonstrated effective cancellation of frequency shifts caused by higher-order harmonic potentials.
• Showed that bias voltage adjustments can compensate for mechanical errors within tolerances.

Conclusions:

• The proposed optimization method effectively addresses imperfect harmonic potential fields in segmented-electrode Orbitraps.
• Ultrahigh mass resolution is achievable with this optimized design.
• The method ensures reliable mass resolution despite manufacturing tolerances.