An electron phase shift down to an order of λ100 (λ is wavelength) was detected for the first time. This was realized by applying longitudinally reversed shearing interferometry in the optical reconstruction stage of electron holography. Thickness changes due to monatomic steps in MoS₂ films were clearly observed in phase-amplified interference micrographs.
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Tonomura et al. (1985) studied this question.
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