A mass spectrometer according to claim 1 in which said electrostatic analyzer (6) comprises a plurality of individual analyzer segments (11-20), each of different effective radii, in which the effective radius of said electrostatic analyzer (6) is varied by applying appropriate potentials to the electrodes comprising any selected one of said analyzer segments.Ĥ.

A mass spectrometer according to claim 1 in which the effective radius of said electrostatic analyzer (6) may be varied, said spectrometer further comprising at least one multichannel detector (34) locatable in the mass dispersed image focal plane of said electrostatic analyzer (6) at whatever value of effective radius that is selected, whereby portions of the mass spectrum of the ions entering said electrostatic analyzer may be imaged on said detector at different dispersions according to the selected value of said effective radius.ģ. A mass spectrometer comprising at least a magnetic analyzer, an electrostatic analyzer, through which ions pass in that order, and ion detector means for detecting at least some of said ions, said magnetic and electrostatic analyzers cooperate to form a direction and velocity focused image, said mass spectrometer having geometrical parameters such that the magnification of said electrostatic analyzer is substantially zero.Ģ. 15-26.ĭymovich, Dorofeev, Petrov, Phys Electron (Moscow) 1966, vol. Ouwerkerk, Boerboom, Matsuo et al., Int J Mass Spectrom & Ion Proc 1986, vol. Murphy, Mauersberger, Rev Sci Instrum 1985, vol. Hu, Chen, Boerboom, Matsuda, Int J Mass Spectrom & Ion Proc 1986, vol. Tuithof, Boerboom Kistemaker et al., Adv in Mass Spectrometry 1978, vol. Tuithof, Boerboom and Meuzelaar, Int J Mass Spectrom & Ion Phys, 1975 vol. and Methods in Physics Research, 1987, pp. 'A Double-Focusing Toroidal Mass Spectrograph for Energetic Plasmas', Ghielmetti et al., Nucl.

Double focusing of mlc