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Terahertz transmission of (i) pure gallium selenide, (ii) 500-ppm indium-doped gallium selenide, and (iii) 500-ppm chromium-doped gallium selenide is taken in the range 0.2–3.0 THz (6.67–100 cm−1 ) to identify the effect of doping on phonon modes. Fourier transform of time domain THz transmission data is fitted with a modified Drude–Smith model to derive phonon mode oscillator strength, phonon relaxation...
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