High-Capacity Electrostatic Ion Trap with Mass Resolving Power Boosted by High-Order Harmonics

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Instrumentation Science

Background:

• Traditional mass analyzers face limitations in resolving power and dynamic range.
• Electrostatic ion traps offer unique trapping and manipulation capabilities for ions.

Purpose of the Study:

• To develop and characterize a new electrostatic ion trap mass analyzer, the orbital frequency analyzer (OFA).
• To evaluate the OFA's performance in terms of mass resolving power and dynamic range.

Main Methods:

• Ions are trapped in high-ellipticity, precessing trajectories within the OFA.
• Orbital frequencies are optimized to be energy-independent for signal processing.
• Fourier transform analysis of image charge signals from ring electrodes generates mass spectra.
• High-order harmonics of orbital frequencies are utilized to enhance mass resolution.

Main Results:

• The OFA demonstrates high mass resolving power, exceeding 150k at m/z 526 Th with a 500 ms transient.
• High-order harmonics significantly improve resolving power compared to fundamental frequencies.
• Isotopic clusters of heavy proteins were resolved using high-order harmonics with reduced transient times.
• Preliminary results indicate a wide dynamic range for the analyzer.

Conclusions:

• The orbital frequency analyzer (OFA) is a promising new electrostatic ion trap mass analyzer.
• The use of high-order harmonics in OFA provides superior mass resolving power, enabling detailed isotopic analysis.
• The OFA exhibits a wide dynamic range and potential for analyzing complex biological molecules.