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A new method for the precise determination of h/e

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Applied Scientific Research, Section B

Summary

A new β-spectrometric method of measuringh/e by using conversion electron lines is proposed. The energy difference between atomic shells is obtained directly in electron volts and this quantity is compared to the corresponding frequency. The accuracy of the method is quantitatively discussed.

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References

  1. The present status of elementary constants is discussed in great detail in some articles by DuMond, J. and E. Cohen, namely: Phys. Rev.82 (1951) 555; A report to the National Research Council Committee on Constants and Conversion Factors of Physics (Privately distributed, 1951); American Scientist, Vol. 40, (July, 1952), No. 3.

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  2. Rutherford, E., W. Lewis and B. Bowden, Proc. Roy. Soc.142 (1933) 347.

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  3. Quoted from Landolt-Börnstein I:5 (Atomkerne), p. 264, Berlin-Göttin-gen-Heidelberg 1952.

  4. Flammersfeld (see ref. 3) gives a lower intensity for the sum (B +Ba), i.e. 3.5.

  5. More preciselyHϱ = 533.66 ± 0.12 according to Craig, H., Phys. Rev.85 (1952) 688.

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  6. Quoted from Cauchois, Y. and H. Hulubei, Tables de Constantes et Données numériques 1, Paris 1947.

  7. Slatis, H. and G. Lindström, Phys. Rev.88 (1952) 1429; Slätis, H., Ark. Fys.6, No. 41 (1953) 415.

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  8. Lindström, G., Ark. Fys.4, No. 1 (1951) 1.

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  9. Landolt-Börnstein, loc. cit.

  10. Flammersfeld (see ref. 9) gives the intensity values 28.4 and ~ 5.0 for theF andI lines respectively.

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Authors and Affiliations

  1. Royal Institute of Technology, Stockholm, Sweden

    Kai Siegbahn

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  1. Kai Siegbahn
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Siegbahn, K. A new method for the precise determination of h/e. Appl. sci. Res. 4, 25–33 (1955). https://doi.org/10.1007/BF02919981

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  • DOI: https://doi.org/10.1007/BF02919981

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