Electron-Paramagnetic Resonance of Photoexcited Trivalent Neodymium Ions in Lanthanum Trichloride Single Crystals

Abstract

The electron-paramagnetic-resonance spectra of ${}_{}{}^{143}{}_{}{}^{}\mathrm{Nd}_{}^{+3\mathrm{}}{}_{}{}^{}$ dilutely substituted for ${\mathrm{La}}^{+3\mathrm{}}$ in La${\mathrm{Cl}}_3$ single crystals have been obtained for the lowest Kramers doublets of the photoexcited ${}_{}{}^4{}_{}{}^{}I_{\frac{13}{2}}^{}{}_{}{}^{}$ and ${}_{}{}^4{}_{}{}^{}I_{\frac{15}{2}}^{}{}_{}{}^{}$ states. The values of the parameters in the spin-Hamiltonian description of the EPR spectra of both ${}_{}{}^{143}{}_{}{}^{}\mathrm{Nd}_{}^{+3\mathrm{}}{}_{}{}^{}$ and ${}_{}{}^{145}{}_{}{}^{}\mathrm{Nd}_{}^{+3\mathrm{}}{}_{}{}^{}$ in these two photoexcited states, as well as in the ground ${}_{}{}^4{}_{}{}^{}I_{\frac{9}{2}}^{}{}_{}{}^{}$ state, have been summarized and compared.