Masashi Nojima
Tokyo University of Science, Japan
Title: A new principle mass spectrometer using two rotating electric fields
Biography
Biography: Masashi Nojima
Abstract
We have invented a new type of mass analyzer, based on a different principle from that of magnetic-sector, time-of-flight (TOF), or quadrupole mass separators. The new principle, which involves introducing a pair of rotating electric fields (REFs). Although earlier studies have already used a REF as the basis of mass separation, a single REF is seldom sufficient for separating ion trajectories based on the ion mass. Those studies also included TOF theory for REF based mass separation. In theory, the new mass analyzer with two REFs shows great promise for separating ion trajectories based on the ion mass. It features a compact ion optical system, which can be designed to fit within a polyethylene terephthalate bottle. The two REFs are generated by applying an AC voltage to a pair of octagonal electrodes optimized with a SIMIONTM simulator, in terms of both shape and interval. The REFs rotate with the same speed and axis, albeit with opposite phases.
We developed a prototype of this REFs mass analyzer using an optimized pair of octagonal electrodes and a focused-ion-beam (FIB) column. And demonstrated the potential to separate different masses simultaneously within continuous beam and also separate gigantic masses i.e. cluster ions, polymer ions, and proteins