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Isotope Shift in Mg I

Bacher, R. F. and Sawyer, R. A. (1935) Isotope Shift in Mg I. Physical Review, 47 (8). pp. 587-591. ISSN 0031-899X. doi:10.1103/PhysRev.47.587.

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The lines of the Mg I spectrum, lying in the visible and in the photographic infrared regions, have been examined and some of them found to show structure. It is pointed out that the structure should be attributed to isotope shift, which, in the case of the 3s3p^1P−3s3d^1D series, owes its origin to the fact that the smd^1D terms, perturbed by the p^2^1D term, have passed on to this term some of their isotope separation, which, in the unperturbed case, would have been the same as that of 3s3p^1P and thus unobservable. This perturbation is discussed in connection with the observed shifts, and it is found possible to correlate the observed shifts with the calculated displacements of the 3smd^1D energy levels produced by the p^2^1D perturbation, with satisfactory agreement. Since the observed patterns show two components, they cannot be attributed to mass effect, which would give three nearly equally spaced components. Furthermore, the shift is in the wrong direction to be accounted for by the usual assumption that heavier isotopes have larger radii, and, consequently, looser binding of electrons than the lighter isotopes.

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Additional Information:© 1935 The American Physical Society. (Received February 25, 1935).
Issue or Number:8
Record Number:CaltechAUTHORS:20141105-123825686
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51303
Deposited By: George Porter
Deposited On:05 Nov 2014 21:29
Last Modified:10 Nov 2021 19:08

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