Multi-Turn Time-of-Flight Mass Spectrometers

e mass resolution of a time-of-flight (TOF) mass spectrometer is directly proportional to its total flight path length.We have developed multi-turn TOF mass spectrometers, where ions are stored in a fixed orbit within an electrostatic sector and allowed to propagate the said orbit numerous times.With each successive orbit the flight path is correspondingly increasing.e first multi-turn TOF mass spectrometer, the MULTUM Linear plus, was developed for cometary exploration.e spectrometer consists of four cylindrical electric sectors and 28 electric quadrupole lenses.e size of the analyzer is 40 cm square.Mass resolution is demonstrated to increase according to the number of ion cycles.A mass resolution of greater than 350,000 was achieved a er 501.5 cycles.Another multi-turn TOF mass spectrometer, the MULTUM II, was also developed in an effort to reduce the number of quadrupole lenses, which consists of only four toroidal electric sectors.We are developing various types of mass spectrometers based on the MULTUM II technology, a TOF/TOF mass spectrometer ʻMULTUM-TOF/TOFʼ, a stigmatic imaging mass spectrometer ʻMULTUM-IMGʼ and miniature mass spectrometers of high mass resolving power ʻMULTUM-Sʼ series.