Letter | Published:

Isotope Effect in the Band Spectrum of Sodium Hydride

Naturevolume 134pages697698 (1934) | Download Citation



As has been pointed out by Hoist and Hulthén1, the elementary theory of isotopy in band spectra cannot account for shifts and the constants of deuterides, determined with the highest precision. They find it necessary, in calculating the reduced mass of the molecule, to add a correction for the electronic masses, which are supposed to partake fully in rotation and vibration. Since this correction is quite general, one would expect it in all deuterides determined with sufficient precision. The only reported cases which fulfil this prescription are: A1H/A1D 2, calculated ratio of the reduced masses CaH/GaD 3, calc. 2 = 0·51276, observed 2 = 0·51337, and from an investigation of NaD by the present author.

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  1. 1

    NATURE, 133, 796, May 26, 1934.

  2. 2

    Hoist, W., and Hulthén, E., NATURE, 133, 496, March 31, 1934.

  3. 3

    Watson, W. W., Phys. Rev., 46, 319 ; 1934.

  4. 4

    Hori, T., Z. Phys., 71, 478 ; 1931.

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  1. Laboratory of Physics, University, Stockholm

    • E. OLSSON


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