Chemical shift of U L3 edges in different uranium compounds obtained by X-ray absorption spectroscopy with synchrotron radiation

• Published in: Bulletin of materials science Vol. 37; no. 3; pp. 643 - 647
• Main Authors: Joseph, D, Nayak, C, Babu, P Venu, Jha, S N, Bhattacharyya, D
• Format: Journal Article
• Language: English
• Published: India Springer India 01-05-2014; Springer Nature B.V
• Subjects: Absorption spectroscopy; Cations; Chemical compounds; Chemical equilibrium; Chemistry and Materials Science; Engineering; Materials Science; Oxidation; Radiation sources; Synchrotron radiation; Synchrotrons; Uranium compounds; Valence; X ray absorption; oxidation state; effective charge; U L3 edge; energy shift; synchrotron radiation; EXAFS
• ISSN: 0250-4707; 0973-7669
• DOI: 10.1007/s12034-014-0679-9

Uranium L
3
X-ray absorption edge was measured in various compounds containing uranium in U
4+
, U
5+
and U
6+
oxidation states. The measurements have been carried out at the Energy Dispersive EXAFS beamline (BL-08) at INDUS-2 synchrotron radiation source at RRCAT, Indore. Energy shifts of ~ 2–3 eV were observed for U L
3
edge in the U-compounds compared to their value in elemental U. The different chemical shifts observed for the compounds having the same oxidation state of the cation but different anions or ligands show the effect of different chemical environments surrounding the cations in determining their X-ray absorption edges in the above compounds. The above chemical effect has been quantitatively described by determining the effective charges on U cation in the above compounds.