A Systematic Analysis of the Spectra of Trivalent Actinide Chlorides in D3h Site Symmetry

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The optical spectra of actinide ions in the compound AnCl₃ and doped into single crystal LaCl₃ were interpreted in terms of transitions within 5f{sup N} configurations. Energy-level calculations were carried out using an effective operator Hamiltonian, the parameters of which were determined by fitting experimental data. Atomic and crystal-field matrices were diagonalized simultaneously assuming an approximate D{sub 3h} site symmetry. The spectroscopic data were taken from the literature but in most cases supplemented by unpublished measurements in absorption and in fluorescence. Spectroscopic data for each ion were analyzed independently, then the model parameters were intercompared and in many cases adjusted … continued below

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v, 284 p. : ill., charts

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Carnall, W. T. November 1989.

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  • Main Title: A Systematic Analysis of the Spectra of Trivalent Actinide Chlorides in D3h Site Symmetry
  • Added Title: ANL (Series)
  • Added Title: Argonne National Laboratory Report ANL-89/39
  • Series Title: Argonne National Laboratory Reports

Description

The optical spectra of actinide ions in the compound AnCl₃ and doped into single crystal LaCl₃ were interpreted in terms of transitions within 5f{sup N} configurations. Energy-level calculations were carried out using an effective operator Hamiltonian, the parameters of which were determined by fitting experimental data. Atomic and crystal-field matrices were diagonalized simultaneously assuming an approximate D{sub 3h} site symmetry. The spectroscopic data were taken from the literature but in most cases supplemented by unpublished measurements in absorption and in fluorescence. Spectroscopic data for each ion were analyzed independently, then the model parameters were intercompared and in many cases adjusted such that in the final fitting process the principal interactions showed uniform trends in parameter values with increasing atomic number. Consistent with analyses of the spectra of lanthanide ions in both LaCl₃ and LaF₃, abrupt changes in magnitude of certain crystal-field parameters were found near the center of the 5f{sup N}-series. This resulted in two groups of parameter values, but with consistent trends for both halves of the series, and generally very good agreement between observed and computed energies. A new energy level chart based on computed crystal-field level energies for each trivalent actinide ion has been prepared. in addition, the parameters of the atomic part of each 5f{sup N} Hamiltonian were used to calculate the matrix elements of U{sup ({lambda})} for selected transitions. The values were tabulated to facilitate calculation of intensity-related parameters for 5f{sup N}-transitions using the Judd-Ofelt theory. 44 refs., 10 figs., 3 tabs.

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v, 284 p. : ill., charts

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  • OCLC: 879645638
  • SuDoc Number: Y 3.AT 7:22/ANL-89/39
  • Report No.: ANL-89/39
  • Grant Number: W-31-109-Eng-38
  • Archival Resource Key: ark:/67531/metadc282995

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  • November 1989

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  • Aug. 4, 2015, 8:33 a.m.

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Carnall, W. T. A Systematic Analysis of the Spectra of Trivalent Actinide Chlorides in D3h Site Symmetry, report, November 1989; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc282995/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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