Magnetic field paralleliser for 2π electron-spectrometer and electron-image magnifier

作者：Pieter C. van der Kruit, Frank H. Read · 发表于：Journal of Physics E Scientific Instruments · 年份：1983 · DOI：10.1088/0022-3735/16/4/016 · 被引用次数：690 · 研究领域：Laser-Matter Interactions and Applications、Mass Spectrometry Techniques and Applications、Advanced Electron Microscopy Techniques and Applications

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.