Mass spectrometer

Abstract

A basic ion optical system (2) in which the temporal focusing of ions is ensured includes a plurality of sector-shaped electrodes (11, 12, 13, and 14), an ion injection slit (15), and an ion ejection slit (16), which are placed on the same plane. A plurality of basic ion optical systems (2) are placed in such a manner as to be mutually separated at predetermined intervals in the direction approximately orthogonal to their planes. The ion ejection slit (16) of the lower-stage basic ion optical system (2) and the ion injection slit (15) of the next-stage basic ion optical system (2) are connected to each other via another basic ion optical system (3) in which the temporal focusing of the ions is ensured. Accordingly, the flight distance can be elongated while assuredly achieving the temporal focusing of the ions as an entire ion optical system (1), and a three-dimensional space can be efficiently utilized to compactify the ion optical system (1).

Dependencies are inferred from the claim text.