Abstract
The broadening of the lines of impurity ions in the substitutionally disordered crystals (x=0, 0.1, 0.5, 1) has been studied. Fluorescence line narrowing removes the inhomogeneous broadening created by variation in the crystal field and results in instrument-limited spectral features for x = 0 and 0.1. Exchange interactions between ions in octahedral positions and ions at second-nearest-neighbour sites cause significant broadening of the narrowed line when x = 0.5 and 1. Comparisons of experimental and simulated spectra have been used to estimate the magnitude of the exchange-coupling constant, - . Such simulations also show that the selection rule for the transition is broken by the spin in the - exchange system.
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