Fourier Transform Ion Trap Mass Analysis by Deciphering Ion Ejection Signals in the Frequency Domain

Area of Science:

• Analytical Chemistry
• Physical Chemistry

Background:

• Conventional ion trap mass analysis relies on time-domain analysis of ion ejection.
• Ion ejection time correlates with mass-to-charge (m/z) ratio.

Purpose of the Study:

• To investigate a new frequency-domain method for ion trap mass analysis.
• To explore the potential for improved mass resolution in ion trap mass spectrometry.

Main Methods:

• Theoretical analysis and ion trajectory simulations of ion ejection signals.
• Experimental implementation using a broadband preamplifier on a miniature ion trap mass spectrometer.
• Analysis of pulsed ion ejection signals in the frequency domain.

Main Results:

• Ions of the same m/z ratio are ejected periodically, creating a pulsed signal.
• The period of the pulsed signal is directly related to the ion's m/z value.
• Experimental results align with theoretical and simulation predictions, achieving a 0.1 Da peak width at m/z 281.

Conclusions:

• The frequency-domain analysis of ion ejection signals offers a promising new approach for mass analysis in ion traps.
• This method has the potential to enhance the mass resolution capabilities of ion trap mass analyzers.
• Proof-of-concept demonstration validates the feasibility and effectiveness of the proposed technique.