Letter | Published:

Electronic Charge from de Broglie Wave-lengths of Electrons

Naturevolume 135page1035 (1935) | Download Citation



WORK has been going on for some years at Uppsala for the purpose of increasing the accuracy of the determination of electron wave-lengths. A high-tension set has been arranged, with a special electron valve smoothing circuit taking up changes in input and output, and a tension regulating device including a standard cell, so as to give high tension accurately known and steady within 0.01 per cent. Cathode rays from a hot filament, accelerated by this tension (V = 15–30 kv.) and passing through two narrow slits are diffracted by an etched galena crystal, giving rise to cross-grating diffraction patterns1. With this arrangement one gets very sharp spectral lines of different orders. The angles of diffraction can therefore be measured with great accuracy. From these data one can calculate the wave-lengths of the cathode rays with an error less than 0.1 per cent, the grating constant of galena being well known2.

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  1. 1

    S. v. Friesen, Arkiv f. Mat. Astr. o. Fys., 24B, No. 8; 1934.

  2. 2

    E. v. Zeipel, ibid., 25A, No. 8; 1935.

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  1. Physics Laboratory, University, Uppsala

    • S. V. FRIESEN


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