Some considerations on ``energy aberrations'' in electron spectrometers containing accelerating (decelerating) components are discussed with regard to their role in the measurement of the energies of electrons. Based on these considerations, design criteria are obtained for an electrostatic decelerating component for a given electron absorption spectrometer. The design criteria are derived by treating the problem of a charged particle in an electrostatic field by means of the Hamiltonian method in classical mechanics, and are found to be related to the curvature of the electrostatic field.

1.
For discussion of some of these devices and for references see
L.
Marton
 and
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,
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(
1958
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2.
Marton, Marton, and Hall, Electron Physics Tables, Natl. Bur. Standards Circ. 571, U.S. Government Printing Office (1956);
P. A. Sturrock, Static and Dynamic Electron Optics (Cambridge University Press, New York, 1955).
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G.
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© 1958 The American Institute of Physics.
1958
The American Institute of Physics
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