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The effect of high hydrostatic pressure (up to 18 kbar) on t h e galvanomagnetic properties of n-and p-Pb, -&,Se ( x 6 0.06) alloys irradiated with electrons ( T 2 300 K , E = 6 MeV, 0 Q 7 x lO"c17-~) has been investigated. It is shown that irradiation creates a band of localized states E,, the energy position of which relative to the valence band top L c depends on alloy composition and on pressure. A model of the energy spectrum of electron-irradiated Pb, -.Sn,Se has been proposed assuming that electron irradiation generates two different types of defects and leads to the appearance of two bands of localized defect states situated within the conduction band and near the valence band top of Pb, -,Sn,Se alloys.

the concept of distributed resistive electrodes. Measurements of the phase modulation across the active area of the liquid crystal cell revealed a linear or quadratic spatial dependence. This allows the generation of new functions useful for the active control of the optical wavefront.