Beschreibung:
AbstractParamagnetic resonance spectra of Eu2+ and Gd3+ ions at Ba2+ sites in BaCl2 were measured at room temperature and liquid nitrogen temperature. There was little difference between the spectra of the same ion taken at the different temperatures. The important parameters in the spin Hamiltonian are: Eu2+(300 °K): b=24 × 10−4 cm−1, b = −450 × × 10−4cm−1; Eu2+ (77 °K): b = 33 × 10−4cm−1, b = −467 × 10−4cm−1; Gd3+(77 °K): b = 84 × 10−4cm−1, b = −461 × 10−4cm−1; g =1.992. The corresponding theoretical values are: Eu2+: b = 104 × 10−4cm−1, b = −357 × 10−4cm−1; Gd3+: b =99 × × 10−4cm−1, b = −334 × 10−4cm−1; g = 1.993.