ESR of Ni²⁺ in AgCl and Isotope Effect in Crystal Field

Abstract

ESR measurements are made on Xi-doped AgCl at low temperatures. As in the case of AgBr :Ki, already investigated, a line with isotropic g-value is found, due to isolated Ni2+. Moreover an angular dependent spectrum with nearly [100]-axial symmetry is observed, which is attributed to complexes of Ni2+ with a silver vacancy. Contrary to the results on AgBr:Ni a structure of the anisotropic spectrum is observed in a small angular range, which may be explained only by the presence of very small orthorhombic perturbations.It is shown, that these orthorhombic perturbations of different quantities result from the variant distributions of both the isotopes 35Cl and 37C1 in the plane perpendicular to the axis of the centre.

The optically detected magnetic resonance of nickel‐doped silver chloride

“…Our g-values are certainly close to the values attributed to uncompensated (NiC1J5-. However, the presence of vacancies around (NiC1,)4-has only a small effect on the g-values, on the order of 0.1% [8,9].3)…”

Isotope Effects in ESR Spectroscopy

“…The influence of isotopes on the fine structure of ESR spectra is described in [127,128,129,130]. The role of the spin-phonon coupling was investigated by Böttger [99] on examining the line splitting of the ESR spectrum of Ni 2+ in MgO, while Tomioka et al .…”

Theoretical Studies of the EPR Parameters for Rh⁺ in NaCl

“…Up to now, however, the above EPR experimental results have not been theoretically explained. On the other hand, extensive theoretical and experimental EPR investigations have been performed for 3d 8 (Ni 2+ ) ions in crystals [8][9][10][11][12]. In general, a 4d 8 ion of the second transition-metal group and a 3d 8 ion of the first transition-metal group may exhibit dissimilar EPR behaviours due to the much stronger spin-orbit coupling interaction in the former.…”