Messung der kontinuierlichen Phasenschiebung von Elektronenwellen im kraftfeldfreien Raum durch das magnetische Vektorpotential einer Wolfram-Wendel

Abstract

An electron interferometer with three biprism fibres is described in which a continuously variable magnetic flux in a long solenoid coil of less than 20 μ diameter can be enclosed by two coherent parts of an electron beam. The partial beams can be separated up to distances of 60 μ without violating the coherence condition if the electron line source is made as narrow as about 100 Å units. The continuous phase shifting action of the enclosed flux on electron waves in a field free space can be demonstrated, and it is found that at normal temperature there is no quantization of magnetic flux in quanta of the orderΦ ₀=h/e=4,13·10⁻⁷ Gauss cm². The flux required to cause a phase difference of 2π is measured and found to coincide with the theoretical valueΦ ₀.