Abstract
The conception of expansion function ϕ(κ) at the exponential of d electron radial wavefunction of transition-metal cations developed in Refs. [1–5] was used to interpret pressure-induced spectral shifts of series of crystals. The red or blue shifts of the spectra of 4 crystals with MgO or CaO as hosts and 3 crystals with α-Al2O3 as hosts were calculated by making use of the parameters obtained from fitting the experimental spectral shifts of MgO:Cr3+ and α-Al2O3:Cr3+ crystals respectively. The results are satisfactory, and it has been found that ϕ(κ) and η(κ) are mainly effected by the host while the difference of the impurity transition-metal ions causes ϕ(κ) and η(κ) varied only slightly.
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