Miniature toroidal radio frequency ion trap mass analyzer.

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Instrumentation Science

Background:

• Miniaturization of analytical instruments is crucial for portable and field-deployable applications.
• Toroidal radio frequency (rf) ion traps offer unique geometric advantages for mass analysis.
• Conventional 3D quadrupole ion traps are widely used but can be bulky.

Purpose of the Study:

• To develop and characterize a 1/5-scale miniature toroidal radio frequency (rf) ion trap mass analyzer.
• To evaluate the performance of the miniature analyzer in terms of ion trapping capacity, mass resolution, and sensitivity.
• To demonstrate the compact nature and potential applications of the novel device.

Main Methods:

• Fabrication of a 1/5-scale toroidal ion trap mass analyzer.
• Operation of the trap using radio frequency (rf) voltages below 1 kVp-p.
• Acquisition of mass spectra using a mass-selective instability scan mode with resonance ejection.
• Analysis of standard compounds including n-butylbenzene, xenon, and naphthalene.

Main Results:

• The miniature toroidal ion trap retains significant ion trapping capacity, comparable to conventional 3D quadrupole traps.
• Unit-mass resolved mass spectra were successfully obtained for n-butylbenzene, xenon, and naphthalene.
• Preliminary sensitivity data for naphthalene were presented, indicating analytical utility.
• The curved geometry facilitates a compact mass analyzer design.

Conclusions:

• The miniature toroidal rf ion trap mass analyzer is a viable compact alternative to conventional designs.
• The device achieves high performance in terms of mass resolution and trapping capacity despite its reduced size.
• This miniaturized analyzer holds promise for portable mass spectrometry applications.