Paramagnetic Resonance in Rare Earth Trichlorides

Abstract

Paramagnetic resonance absorption of all the naturally occurring rare earth trivalent ions in the LaCh structure have been investigated. The results are summarized in the form of a tabulation of the parameters gil, gl, A, B, P, Ll in the spin-Hamiltonian. Theoretical calculations of crystal field states and eigenvalues as well as of gil and gl, based on optical measurements, are discussed.

Magnetic resonance in Kazan and in Oxford

“…Rather similar magnetic properties are found in the anhydrous lanthanide chlorides LnC13, a second series with hexagonal symmetry [30]. Two lowlying doublets occur in the cerium compounds, but are interchanged in energy; in LaC13, the ground state of cerium is similar to that with energy 3(1) cm -1 above the lowest doublet in LnETS.…”

Low-Temperature Magnetic Properties of Some Hexagonal Rare-Earth Trihalides

“…10, 1201 (1965 For the three Kramers ions studied, Ce 3+ , Nd 3+ , and Sm 3+ , the ground-state doublets in the trichlorides lie, respectively, 67.6, 166.0, and 58.6 K below the first excited state. 11,13 ' 15 Pr 3+ is not a Kramers ion; however, the point symmetry is such that an "accidental" ground-state doublet occurs with a splitting, 8 A, of ^0.03 K. This level lies 47.6 K below the first excited state which is a singlet. 9,10 Values of these splittings in the tribromides are not available, but we assume that they are close to those of the trichlorides.…”

“…Hutchison and Wong 8 have carried out an electron spin resonance (ESR) study of the various rare-earth ions diluted in LaCl 3 . Dieke and others [9][10][11][12][13][14][15][16][17][18][19][20][21][22] have made extensive studies of the optical spectra of the rare-earth trihalides.…”

Molecular Dynamics of Gd(III) Complexes in Aqueous Solution by HF EPR

“…The 8 S 7/2 ion Gd(III) is well known to undergo zero-field splitting in the solid state, as observed in a number of compounds such as gadolinium chloride (Hutchinson and Wong, 1958) or Gd(III) doped into lanthanide ethylsulfates (Abragam and Bleaney, 1970;Smith et al, 1977). Proposed thirty years ago by Hudson and Lewis(Hudson and Lewis, 1970), the basic theory of the EPR line shape of Gd(III) complexes uses a transient zero-field splitting (modulated by rotation or molecular distortions) as the main relaxation mechanism.…”