Paramagnetic Suseptibilities and Electronic Structure of AqueousCations of Elements 92 to 95

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Magnetic susceptibilities per gram atomic weight of elements 92 to 95 in most of their oxidation states were measured on 0.1 ml of solution which was 0.007 to 0.09 M in heavy element. The values obtained (all paramagnetic) in c.g.s. units x 10{sup 6} were: U(IV), 3690; Np(VI), 2060; Np(V), 4120; Np(IV), 4000; Pu(IV), 1610; Pu(III), 370; Am(III), 720. The results could be interpreted only on the basis of electronic configurations 5f{sup n}, even though susceptibilities were generally lower than the theoretical values and lower than experimental values for corresponding lanthanide cations. The lower values should be expected as a ... continued below

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Howland, Jerome J. & Calvin, Melvin November 12, 1948.

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Magnetic susceptibilities per gram atomic weight of elements 92 to 95 in most of their oxidation states were measured on 0.1 ml of solution which was 0.007 to 0.09 M in heavy element. The values obtained (all paramagnetic) in c.g.s. units x 10{sup 6} were: U(IV), 3690; Np(VI), 2060; Np(V), 4120; Np(IV), 4000; Pu(IV), 1610; Pu(III), 370; Am(III), 720. The results could be interpreted only on the basis of electronic configurations 5f{sup n}, even though susceptibilities were generally lower than the theoretical values and lower than experimental values for corresponding lanthanide cations. The lower values should be expected as a result of the Stark effect produced by fields of anions and of water dipoles. Failure of the Russell-Saunders approximation to the coupling between electrons may account for some of the error in the theoretical calculations. Wider multiplet splitting in the actinides accounts for the fact that the susceptibilities of Pu(III) and Am(III) are many-fold lower than those of Sm(III) and Eu (III) respectively.

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  • Report No.: UCRL--206
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/929393 | External Link
  • Office of Scientific & Technical Information Report Number: 929393
  • Archival Resource Key: ark:/67531/metadc895987

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  • November 12, 1948

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 3, 2016, 8:18 p.m.

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Howland, Jerome J. & Calvin, Melvin. Paramagnetic Suseptibilities and Electronic Structure of AqueousCations of Elements 92 to 95, report, November 12, 1948; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc895987/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.