A Pt- and Li-related line spectrum, with a series of sharp lines between about 5000 and 8000/cm, was studied using excitation spectroscopy and uniaxial stresses. The intensity of the lines was enhanced when Pt and Li diffusion was carried out under Li-rich conditions. Phonon replicas were detected in the spectrum, and the phonon was suggested to be Li-related. It was also observed directly by using local-mode vibrational spectroscopy. Yet another set of replicas was observed, displaced to higher energies, and was suggested to originate from shake-up effects in the final core state. Uniaxial stress spectroscopy revealed that shallow donor states were involved in the final state of the transitions.

Excitation spectrum of a PtLi-related center in silicon P.Tidlund, M.Kleverman, P.Hazdra: Physical Review B, 1999, 59[7], 4858-63