Abstract
The high resolution infrared luminescence spectra of ReCl6 2- in K2PtCl6 and of ReBr6 2- in Cs2ZrBr6 have been measured between 10 000 cm-1 and 3000 cm-1 at liquid helium temperatures. Comparison with the luminescence spectra in the visible region has enabled nine luminescence transitions to be observed in the bromide and five in the chloride. These correspond to every transition between states separated by more than six quanta of the ν3 vibrational mode of the ion. Most of the transitions show extensive vibrational structure but the relative intensities of the magnetic dipole origins and the three vibronic origins vary greatly from transition to transition. The mechanisms of the various radiative and non-radiative processes are discussed.
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