An electrically compensated trap designed to eighth order for FT-ICR mass spectrometry

Area of Science:

• Analytical Chemistry
• Physical Chemistry
• Spectroscopy

Background:

• Nonlinear electric fields in traps cause ion cyclotron frequency variations.
• These variations decrease mass resolving power and signal-to-noise ratios.
• Existing Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry techniques are limited by these effects.

Purpose of the Study:

• To design and evaluate a novel FT-ICR compensated trap.
• To reduce spatial variations in ion cyclotron frequency.
• To enhance mass resolving power and signal-to-noise.

Main Methods:

• Theoretical modeling of trapping electric fields to eighth order.
• Design and construction of a compensated ion trap.
• Experimental evaluation comparing compensated and uncompensated traps.

Main Results:

• The compensated trap design effectively reduces cyclotron frequency spread.
• Achieved at least a threefold increase in mass resolving power.
• Demonstrated improved signal-to-noise ratios compared to uncompensated traps.
• Attained resolving powers as high as 1.7 x 10(7) for vasopressin [M + H](+).

Conclusions:

• The compensated trap design successfully mitigates nonlinear field effects.
• This innovation significantly advances FT-ICR mass spectrometry performance.
• The compensated trap offers a substantial improvement for high-resolution mass analysis.