An electrostatic autoresonant ion trap mass spectrometer

• Published in: Review of scientific instruments 2010-01, Vol.81 (1), p.013107-013107-8
• Main Authors: Ermakov, A. V., Hinch, B. J.
• Format: Article
• Language: English
• Subjects: Computer Simulation; CONFINEMENT; DESIGN; Equipment Design; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; IONS; Ions - chemistry; MAGNETS; MASS RESOLUTION; MASS SPECTROMETERS; Mass Spectrometry - instrumentation; Mass Spectrometry - methods; Pressure; SENSITIVITY; SIMULATION; Static Electricity; TOLERANCE; TRAJECTORIES; TRAPS
• ISSN: 0034-6748; 1089-7623
• DOI: 10.1063/1.3276686

A new method for ion extraction from an anharmonic electrostatic trap is introduced. Anharmonicity is a common feature of electrostatic traps which can be used for small scale spatial confinement of ions, and this feature is also necessary for autoresonant ion extraction. With the aid of ion trajectory simulations, novel autoresonant trap mass spectrometers (ART-MSs) have been designed based on these very simple principles. A mass resolution ∼ 60 is demonstrated for the prototypes discussed here. We report also on the pressure dependencies, and the (mV) rf field strength dependencies of the ART-MS sensitivity. Importantly the new MS designs do not require heavy magnets, tight manufacturing tolerances, introduction of buffer gases, high power rf sources, nor complicated electronics. The designs described here are very inexpensive to implement relative to other instruments, and can be easily miniaturized. Possible applications are discussed.