Prismatic mass analyzer with the conical achromatic prism and transaxial lenses

Abstract

The conical achromatic prism (CAP) has a record angular dispersion equal to about 50 radians on per 100% of mass variation. In CAP, electric and magnetic fields are realized whose potentials in a spherical coordinate system depend only on angular variables. The particles of a homogeneous planar parallel ion beam move in the mean plane of the CAP along similar trajectories and maintain parallelism at the exit from the CAP. The CAP also possesses by energy focusing, and the parallelism of the volume beam is maintained due to its telescopiс in the vertical direction. CAP can be used in a prismatic mass spectrometer, which in its scheme is like to a prismatic light-optical spectrometer equipped with a collimating and focusing lenses. The linear dispersion of the prismatic spectrometer is equal to the angular dispersion of the CAP multiplied by the focal length of the focusing lens. A prismatic device is designed in which three-electrode transaxial lenses are used as a collimating and focusing lenses. By using a positional detector located in the focal plane of the focusing lenses, the instrument can also be used as a mass spectrograph.