ISOTOPE SHIFT IN THE ARC SPECTRUM OF NICKEL

Journal Article · Wed Mar 15 04:00:00 EST 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.121.1726· OSTI ID:4050300

Schroeder, D J; Mack, J E

The isotope shift in 31 spectral lines in the nickel arc spectrum was determired by the use of a Fabry-Perot interferometer. Ths normal mass shifts were calculated ( approx equal +O 025 cm/sup -1/ between Ni/sup 58/ and Ni/sup 64/ ) and subtracted fr om the observed isotope shifts. The differences were attributed to the specific mass and field effects. The relative shifts of levels of four configurations were deduced from the observed line shifts, these being the "complex" corfigurations 3d/sub 8/4s/sub 2/ and 3d/sub 8/4s4p and the two- electron configurations 3d/sup 9/4s and 3d/sup 9/4p. It was shown that the shifts due to the specific mass effect are a significant part of the observed shifts. Perturbations due to interconfiguration interactions were postalated to explain some of the observed shifts. The isotops shift to be expected between Ni/ sup 58/ and Ni/sup 64/ on the basis of fleld effect calculations is about -0.01 cm/sup -1/ for a single 4s electron, while the shifts observed are as large as +0.190 cm/sup -1/. A large fraction of this shift must thsrefore be attributad to the specific mass effect. By noting the deviations of the relative shifts between adjacent pairs of even isotopes from those predicted by mses effect theory, it was possible to deduce the relative field effect. The relative level shift resulting from the field effect is nearly the same for the adjacent isotope pairs 60-61 and 62-64 while the relative level shift for the isotope pair 58-60 is approximately 0.004 cm/sup -1/ larger than that for the other adjacent isotope pairs. The arrangement of neutrons in the outermost nuclear shells is believed to account for this difference. Within the experimental error the level shift of the Ni/sup 81/ relative to the neighboring even isotopes is such that there is no oddeven staggering of the levels. (auth)

• Research Organization: Univ. of Wisconsin, Madison
• NSA Number: NSA-15-014890
• OSTI ID: 4050300
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 121; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

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