Electron-Nuclear Double Resonance of Samarium 147 and Samarium 149 Tripositive Ions in Lanthanum Trichloride Single Crystals

The electron-nuclear-double-resonance spectral frequencies of ¹⁴⁷Sm⁺³ and ¹⁴⁹Sm⁺³ ions dilutely substituted at La⁺³ ion sites in LaCl₃ single crystals at 2.07 ^∘{}K have been measured. The experimental results for both nuclides have been summarized by giving values of the parameters in a spin Hamiltonian for a least-squares best fit to the measurements. The values of (a) nuclear g factors and nuclear magnetic-dipole moments for both nuclides, of (b) 〈r^-3〉 for the f electron-nuclear distance in Sm⁺³, of (c) ratios of nuclear magnetic-dipole moments and (d) ratios of nuclear electric-quadrupole moments for the two nuclides, and of (e) the ratio of the crystal-field shielding and antishielding factors 1-σ₂ and 1-γ_∞ for Sm⁺³ in LaCl₂, which are obtainable from these measurements, are discussed and tabulated.