A neutral, ground-state, ⁴He atom beam has been focused using Fresnel zone plates. At only moderate demagnification (0.40×), a focused spot diameter of ≤2.0μm is achieved at a signal intensity of 500 counts/s. This is an improvement over previous work by a factor of 10 in resolution, 10³ in signal intensity, and 10⁸ in focused beam density, and allows the full intrinsic intensity profile of a focused atomic Fresnel spot to be measured for the first time. Raster scans of 15 and 25μm wide slits across the focused spot demonstrate transmission scanning helium de Broglie microscopy of micron resolution.
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Doak et al. (1999) studied this question.
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