Mass Ratio of the Lithium Isotopes from the Spectrum of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Li</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

G. M. Almy; G. R. Irwin

doi:10.1103/PhysRev.49.72

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Mass Ratio of the Lithium Isotopes from the Spectrum of ${Li}_{2}$

G. M. Almy and G. R. Irwin

Physics Department, University of Illinois

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Phys. Rev. 49, 72 – Published 1 January, 1936

DOI: https://doi.org/10.1103/PhysRev.49.72

Abstract

It is shown from a study of the ${}^{1}Σ \to {}^{1}Σ {Li}_{2}$ band system that the relative masses of the two isotopes of Li as calculated from the observed isotope effect in each of the two lowest states of ${Li}_{2}$ is in excellent agreement with the mass ratio obtained by other precise methods. Various methods of treating the data lead consistently to the conclusion that the mass-coefficient $ρ$ is 1.04077±0.00004 and that the mass ratio is 1.16640±0.00016. This result disagrees with that of McKellar and Jenkins who, from a less extensive study of the ${}^{1}Π \to {}^{1}Σ$ system of ${Li}_{2}$ , concluded that the mass ratio was 1.1678±0.0008, a result which cast suspicion upon the band spectrum method of determining relative atomic masses. There has also been found a small but definite electronic isotope shift: $ν_{e}^{i} - ν_{e} = - 0.064 \pm 0.010$ ${cm}^{- 1}$ .

References (12)

R. de L. Kronig, Physica 1, 617 (1934)
G. H. Dieke, Phys. Rev. 47, 661 (1935)
Holst and Hulthèn, Zeits. f. Physik 90, 712 (1934)
F. A. Jenkins and A. McKellar, Phys. Rev. 44, 325 (1933) A. McKellar, 44, 155 (1933)
K. T. Bainbridge, Phys. Rev. 44, 56 (1933)
M. L. E. Oliphant, A. E. Kempton and Lord Rutherford, Proc. Roy. Soc. A149, 406 (1935)
K. Wurm, Zeits. f. Physik 59, 35 (1929)
G. M. Almy and G. R. Irwin, Phys. Rev. 48, 104 (1935)
F. W. Loomis and R. E. Nusbaum, Phys. Rev. 38, 1447 (1931)
J. L. Dunham, Phys. Rev. 41, 721 (1932)
Omitted endnote
H. Schüler and E. Wurm, Naturwiss. 15, 971 (1927) D. S. Hughes, Phys. Rev. 36, 698 (1930) ibid. 38, 857 (1931)

[c1] R. de L. Kronig, Physica 1, 617 (1934)

[c2] G. H. Dieke, Phys. Rev. 47, 661 (1935)

[c3] Holst and Hulthèn, Zeits. f. Physik 90, 712 (1934)

[c4] F. A. Jenkins and A. McKellar, Phys. Rev. 44, 325 (1933) A. McKellar, 44, 155 (1933)

[c5] K. T. Bainbridge, Phys. Rev. 44, 56 (1933)

[c6] M. L. E. Oliphant, A. E. Kempton and Lord Rutherford, Proc. Roy. Soc. A149, 406 (1935)

[c7] K. Wurm, Zeits. f. Physik 59, 35 (1929)

[c8] G. M. Almy and G. R. Irwin, Phys. Rev. 48, 104 (1935)

[c9] F. W. Loomis and R. E. Nusbaum, Phys. Rev. 38, 1447 (1931)

[c10] J. L. Dunham, Phys. Rev. 41, 721 (1932)

[c11] Omitted endnote

[c12] H. Schüler and E. Wurm, Naturwiss. 15, 971 (1927) D. S. Hughes, Phys. Rev. 36, 698 (1930) ibid. 38, 857 (1931)

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Mass Ratio of the Lithium Isotopes from the Spectrum of ${Li}_{2}$

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Mass Ratio of the Lithium Isotopes from the Spectrum of Li2

Abstract

References (12)

Mass Ratio of the Lithium Isotopes from the Spectrum of ${Li}_{2}$