The Emission Spectra for the Cs_2NaScCl_6:MoCl_6^{3-} System in the Fm3m Space Group

• Authors: R. Acevedo , T. Meruane , G. Navarro
• Languages of publication: EN

Abstracts

EN

On the basis of the data reported by Flint and Paulusz, we have undertaken a theoretical investigation of the intensity mechanism for the various emissions:Γ_8(^2T_{2g} ) → Γ_8(^4A_{2g}), Γ_8(^2E_{g}), Γ_8(^2T_{1g}), Γ_6(^2T_{1g}) for the Cs_2NaScCl_6:MoCl_6^{3-} system in the Fm3m-space group. The experimental data available refer to the visible and near infrared luminescence spectra of MoCl_6^{3-} complex ion in different hosts, such as Cs_2NaMCl_6 (M = Sc, Y, In), measured between 15,000 cm^{-1} and 3,000 cm^{-1} at liquid helium temperatures. At least, five luminescence transitions have been identified and assigned and each of them show extensive vibronic structure. A careful analysis of this experimental data shows that for the various observed electronic transitions, the vibrational frequencies change only slightly, and therefore there is no indication that the system undergoes both a significant and relevant Jahn-Teller distortion (along an active coordinate). There is however clear evidence that for the chloro-elpasolites, there is a strong resonance interaction between ν_3(τ_{1u} : stretching) of the MoX_6^{3-}, complex ion and that of the host when M = In, Y. Thus for M = Sc, the slighter higher host ν_3, wave number is likely to minimize the effect of this coupling. This evidence will allow us for the Cs_2NaScCl_6:MoCl_6^{3-} system to neglect, in the first-order approximation, the coupling among the internal and the external vibrations and to proceed using a both a molecular and the independent system models.

Keywords

EN

32.70.Fw; 32.70.Cs

Discipline

• 32.70.Cs: Oscillator strengths, lifetimes, transition moments
• 32.70.Fw: Absolute and relative intensities

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 2
• Pages: 233-242

Dates

published

2001-02

received

2000-04-20

(unknown)

2000-12-27

Contributors

author

R. Acevedo

• Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beaucheff, 850, Casilla, 2777, Santiago, Chile

author

T. Meruane

• Departamento de Química, Universidad Metropolitana de Ciencias, de la Educación, Av. J.P. Alessandri, 774, Casilla 174-C, Santiago, Chile

author

G. Navarro

• Comisión Chilena de Energía Nuclear, Amunátegui 95, Casilla 188-D, Santiago, Chile

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Identifiers

DOI

10.12693/APhysPolA.99.233