Abstract
The ion kinetic energy spectra (IKES) obtained from a Mattauch—Herzog-type mass spectrometer can be improved by two modifications. The insertion of a variable beta slit and electron multiplier into the field-free region between the electric sector and the magnetic sector improves the energy resolution from 3% to 0 ̃ .6%. A three-element electrostatic lens, i.e. Einzel lens, can be inserted ahead of the variable slit. The design of a suitable Einzel lens is discussed and shown, by ion trajectory computation, to focus the ion beam and permit scanning of an IKES. The ion trajectories were obtained using potentials computed within the Einzel lens using the Schwarz—Christoffel transformation. The limitations of the computation are discussed. Based upon these calculations, the energy resolution of the instrument should improve to 0 ̃ .14%.
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