Abstract
Recent years have seen tremendous advances in analytical electron microscopy and increased interest in electron energy loss spectroscopy has been especially prominent. Due to these developments there have been many discussions in the literature of the use of magnetic spectrometers in energy analysis. The aberrations of magnetic prisms have also received numerous treatments [1-4] although not specifically emphasizing energy analysis in the electron microscope. The importance of the objective and post-specimen lenses on the effective spectrometer resolution, however, has been discussed in recent papers by Crewe [5,6]. To our knowledge, the correction of those aberrations of importance in an electron microscope spectrometer have not been adequately delineated. Recent work of H. Shuman, et al. [7] has demonstrated whole sets of uniform field magnetic prisms with curved pole faces which simultaneously eliminate the main second-order aberrations affecting the energy resolution in addition to making the focal plane perpendicular to the central ray (useful for parallel recording of spectra).
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