Origin of additional satellites in electron paramagnetic resonance spectra of rare earth ion pairs

• Published in: Chemical physics letters Vol. 380; no. 5; pp. 563 - 568
• Main Authors: Guillot-Noël, O., Goldner, Ph, Higel, P., Gourier, D.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 28.10.2003; Elsevier Science
• Subjects: Atomic and molecular physics; Electron resonance and relaxation; Exact sciences and technology; Molecular properties and interactions with photons; Physics; g-factor; Zeeman effect; Medium effect; Ion pairs; Theoretical study; Crystallographic site; Crystal field; Experimental study; Satellite lines; EPR spectra; Neodymium ions
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2003.09.046

Electron Paramagnetic Resonance (EPR) spectrum of pairs of two identical rare earth ions is considered in the case where the two ions feel slightly different crystal fields giving different g factors. When the differences Δ g between the g factors give a Zeeman difference term Δ gβB 0 of the order of magnitude of the interaction between the two ions, the pair spectrum is composed of four lines instead of two: the usual doublet structure, and two additional satellites around the main central transitions. It is shown that for rare earth ions, the shape of the EPR pair spectrum is very sensitive to small g factor differences. This situation is illustrated by the case of neodymium pairs in the SrAl 12O 19 host.