I1 has teen shown that insulating LiH and LiD transform gradually to a semiconducting state at about 30 GPa and room temperature. It was +so found that these compounds undergo a semiconductoi-to-semmeral transition at about 43 GPa The akserved phenomena can probably @explained by a first-order phase B1-to-B2 structure transition.

An experimental study is made of resonant secondary emission, reflection, and excitation spectra which indicate the existence of bound excitons in LiH-Mg crystals. The spectroscopic properties of the bound exciton are studied by selectively excited luminescence and resonant Raman scattering. The resonance energy of the bound exciton is estimated to be 4.842 eV. For the first time, the transformation of resonant Raman scattering into luminescence is found when the incident photon energy is above the resonance. pacceman B nmM&iHecueHuEIm, KorAa 3~e p r m nanaiouero @oToHa npeBbImaeT 3~e p r~m p e 3 0~a~c~o r o nepexona.

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