Abstract
An electron paramagnetic resonance (EPR) study of trivalent neodymium ion in phosphate and borate glasses was carried out at 10 K. The observed EPR spectra were described by spin Hamiltonian with an effective spin S=1/2 and tetragonal symmetry. By fitting the observed spectra with those obtained by computer simulations, g-factor parameters of spin Hamiltonian were determined. From these g-factor values, it was established that the lower ground state energy level of Nd 3+ in these glasses is the Kramers doublet Γ t6 and the wavefunctions for this state were calculated. These ground state wave functions were mainly composed of | M J |=7/2 and 1/2 states, with a very small admixture of | M J |=9/2 states. The results are compared with other crystalline matrices and it is concluded that the Nd 3+ ions in these glasses dictate their own environment and impose sites with more or less defined symmetry and co-ordination.
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