期刊
APPLIED PHYSICS LETTERS
卷 109, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4955457
关键词
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资金
- JSPS KAKENHI Grant [25706031, 15K13404]
- Grants-in-Aid for Scientific Research [15K13404, 25706031, 26400417] Funding Source: KAKEN
The space charge effect has been clearly observed in the energy distributions of picosecond pulse beams from a spin-polarized electron microscope, and was found to depend upon the quantity of charge per pulse. The non-linear phenomena associated with this effect have also been replicated in beam simulations that take into account of a three-dimensional space charge. The results show that a charge of 500 aC/pulse provides the highest brightness with a 16-ps pulse duration, a 30-keV beam energy, and an emission spot of 1.8 mu m. Furthermore, the degeneracy of the wave packet of the pulsed electron beam has been evaluated to be 1.6 x 10(-5) with a charge of 100 aC/pulse, which is higher than that for a continuously emitted electron beam despite the low beam energy of 30 keV. The high degeneracy and high brightness contribute to the realization of high temporal and energy resolutions in low-voltage electron microscopy, which will serve to reduce radiolysis damage and enhance scattering contrast. (C) 2016 Author(s).
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