title: The tripole linear ion trap with highly efficient orthogonal ion ejection designed by computer simulations.
abstract: An ion guide, consisting of three rods carrying three alternating current (AC) voltages symmetrically delayed, called a tripole, was used as a linear ion trap (LIT) and studied by computer simulations. Radial containment of ions was also demonstrated with the pseudopotential which was calculated by approximating the tripole electric potential to the multipoles expansion. This work found a new analyte concentrator, which performs effective ion ejection, and is suitable for use with time-of-flight mass spectrometry. The efficiency of the overall process from the trapping until the ejection was higher than 90%, although some degree of ion spatial and kinetic energy spread which can be corrected with a reflectron was obtained. The reason for the ejection of this tripole linear ion trap (tLIT) lies in the high space available between the rods. The ejection is optimized with the application of focusing voltages, especially suitable for a tripole symmetry (one electrode has a pulse offset voltage and the other two have a fraction of that pulse). The beam is finally well parallelized with a rectangular Einzel lens.
authors.affiliation: Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami ku, Hiroshima City, Hiroshima, Japan.
authors.forename: Gary A
authors.initials: GA
authors.lastname: Salazar
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Masujima
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D017076:Computer-Aided Design; D004574:Electromagnetic Fields; D004867:Equipment Design; D007477:Ions; D013058:Mass Spectrometry / Q000295:instrumentation*; D012984:Software
chemical_list: D007477:Ions