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The green cathodoluminescence of natural and synthetic mercur sulphide (α-HgS) is investigated. It is interpreted in terms of an edge emission involving a phonon with an energy of ≈ 20 meV. The transitions are of the bound-to-bound type at liquid helium, and of the free-to-bound type for higher temperatures. The complexity of the emission makes it difficult to interpret it by a clearly-defined model. Donor states with bound energies of ED ≧ 8 meV and 20 meV < ED < < 30 meV and acceptor states with an energy of ≈ 40 meV are involved in the emission.
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Massé et al. (1977) studied this question.
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