US Patent No. 7,820, 961. Mass spectrometer and mass spectrometry method. Inventors: Masuyuki Sugiyama, Yuichiro Hashimoto, Hideki Hasegawa, Izumi Waki. Assignee: Hitachi.
Describes a linear trap mass spectrometer that has high ejection efficiency and low ejection energy. The mass spectrometer has quadrupole rod structure applied with RF voltage into which ions are introduced and ejected mass selectively.