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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. https://resolver.caltech.edu/CaltechAUTHORS:20141105-123825686

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRev.47.587DOIArticle
https://journals.aps.org/pr/abstract/10.1103/PhysRev.47.587PublisherArticle
Additional Information:© 1935 The American Physical Society. (Received February 25, 1935).
Issue or Number:8
Record Number:CaltechAUTHORS:20141105-123825686
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141105-123825686
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51303
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:05 Nov 2014 21:29
Last Modified:03 Oct 2019 07:31

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