Pressure-Dependent Coupling of the3A2(F) and1T2(D) States of Ni2+in ZnS and ZnSe

In ZnS the Tq(F)-Tq(P) transition of isolated Ni + causes structured near infrared absorption and emission bands. Crystals doped in the sub-ppm region exhibit exceptionally sharp lines suited to study the dependence on external fields. Here, the fine structure of the perfectly cubic and one axial Ni center is studied. A secure assignment of the observed optical transitions is achieved on the basis of high-resolution absorption and emission investigations at various crystal temperatures and in magnetic fields up to 15 T. The experimental results give evidence for intermediate dynamical Jahn-Teller efFects in both the Ti(F) ground and the Ti(P) excited state, which sre attributed to the coupling to local Tq-type modes. A detailed comparison shows good agreement between the experimental data for ZnS:Ni and those of the well understood system CdS:Ni. A Pano-type structure in the Ti(F)-Ti(P) absorption is explained by the coupling of s distinct local mode of the Ni center to a continuum of phonon states. Additionally, the interaction of low-&equency acoustical phonons with the Ni center is investigated. No thermal equilibrium is established in the excited Ti(P) state during its lifetime, which gives rise to hot emission lines.

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Pressure-Dependent Coupling of the³A₂(F) and¹T₂(D) States of Ni²⁺in ZnS and ZnSe

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High-resolution Zeeman spectroscopy ofNi2+in ZnS

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