Spectral Intensities for the Emission | 4 S{3/2}Γ 8 >-->| 4 I{15/2}Γ--> in the Cs 2 NaErCl 6

R. Acevedo a , A. Soto-Bubert a , G. Navarro b , T. Meruane c and W. Stręk d a Departamento de Quimica Basica, Facultad de Ciencias Fisicas y Matematicas Universidad de Chile, Beauchef 850, Casilla 2777, Santiago, Chile b Instituto de Ciencias Basicas, Facultad de Ingenieri a Universidad Diego Portales, Av. Ejercito No. 441, Casilla 298-V, Santiago, Chile c Departamento de Quimica, Universidad Metropolitana de Ciencias de la Educacion, Av. J.P. Alessandri 774, Casilla 147-C, Santiago, Chile d Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland

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Received: November 5, 2003; in final form January 12, 2004

We report explicit vibronic intensity calculations for the | 4 S{3/2}Γ 8 >-->| 4 I{15/2}Γ> excitations in the Cs 2 NaErCl 6 elpasolite-type systems, based upon new and updated experimental data, obtained from optical absorption measurements made at 10K, in the energy range from 6,000 up to 26,000cm -1 . Our calculation model is a generalization of the vibronic crystal field-ligand polarization method and the calculation is performed using a minimum set of adjustable parameters --- all and each of them have a clear physical meaning. Our strategy was chosen so as to make a significant distinction with previous calculations, performed by other authors, who have worked out a model originated from a supra-parameterized scheme, within the framework of the superposition model of Newman. Throughout the course of the current work, it is shown that our model is suitable to handle this kind of calculations and also that the numerical results obtained are in fairly good agreement with experiment.

DOI: 10.12693/APhysPolA.105.233 PACS numbers: 32.70.Cs