Magnetic field paralleliser for 2π electron-spectrometer and electron-image magnifier
- 1 April 1983
- journal article
- Published by IOP Publishing in Journal of Physics E: Scientific Instruments
- Vol. 16 (4) , 313-324
- https://doi.org/10.1088/0022-3735/16/4/016
Abstract
An electron-optical device has been constructed in which electrons originally emitted over 2 pi steradians from a region of small volume are formed into a beam of half-angle 2 degrees . The instrument makes use of a magnetic field that diverges from 1 to 10-3 Tesla. The energies of the electrons parallelised in this way have been measured with a time-of-flight technique, giving energy resolutions as low as 15 meV. Electrons of energy 0-3 eV, formed in multiphoton ionisation, were used for these tests. The device can also act as an electron-image magnifier, giving a spatial resolution of a few mu m in the source plane. Detailed theoretical and computational results on the properties of the new apparatus are given.Keywords
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