Improved Miniaturized Linear Ion Trap Mass Spectrometer Using Lithographically Patterned Plates and Tapered Ejection...

Area of Science:

• Analytical Chemistry
• Mass Spectrometry Instrumentation

Background:

• Previous linear ion trap mass spectrometer designs faced limitations in performance and miniaturization.
• Issues such as charge build-up and ion blocking at ejection slits hindered optimal performance.

Purpose of the Study:

• To develop a new two-plate linear ion trap mass spectrometer addressing prior design challenges.
• To enhance both the performance and miniaturization capabilities of ion trap mass spectrometers.

Main Methods:

• Utilized borosilicate glass substrates with patterned aluminum electrodes and wire-bonded printed circuit boards.
• Incorporated tapered ejection slits to mitigate charge build-up and ion trajectory issues.
• Optimized plate spacing using a motorized translation stage for operational adjustments.

Main Results:

• Achieved a scan rate of 2300 Th/s for a mixture of toluene, deuterated toluene (D8), and xylenes.
• Demonstrated narrowest peak widths of 0.33 Th (Full Width at Half Maximum - FWHM).
• The tapered slit design facilitated miniaturization of trap features while maintaining substrate ruggedness.

Conclusions:

• The new two-plate linear ion trap design successfully overcomes performance and miniaturization limitations.
• The tapered ejection slits are crucial for improved ion handling and enable robust, compact mass spectrometer development.
• This advancement supports the creation of smaller, field-deployable mass spectrometry instruments.