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Title: Optical Absorption Characteristics For 7F0'→5L6' and 7F0'→7F6' Transitions of Trivalent Americium Ion in Aqueous Electrolyte Mixtures

Here, optical absorption features for 7F 0'→ 5L 6' and 7F0'→ 7F 6' transitions of trivalent americium ion were investigated in a wide range of aqueous combinations of perchloric and nitric acids (0.1 – 6.0 mol L -1). The developed qualitative matrix of extinction coefficients measures the cumulative impact of increasing electrolyte content, changes of hydration of americium ion, and inner-sphere perturbation by nitrate on the absorbance. The effects of growing complexity of aqueous electrolyte medium were highlighted for the 7F 0'→ 5L 6' transition. Spectroscopy indicates the perturbation of the inner hydration sphere of trivalent f-element by one nitrate ligand, whilst the accompanying stability constants for the interaction of europium ion with nitrate point to outer-sphere coordination of the f-element by the second nitrate.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States). Aqueous Separations and Radiochemistry Dept.
Publication Date:
Report Number(s):
INL/JOU-17-40932
Journal ID: ISSN 0003-7028
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Applied Spectroscopy
Additional Journal Information:
Journal Volume: 71; Journal Issue: 12; Journal ID: ISSN 0003-7028
Publisher:
Society for Applied Spectroscopy
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; actinides; ALSEP process; aqueous holdback reagents; lanthanides; phase transfer kinetics; Trivalent americium; f-element optical spectroscopy; nitrate complexation; inner and outer sphere complexes
OSTI Identifier:
1411731