5 SIMPLE TECHNIQUES FOR BAGA4SE7 CRYSTAL

′�?, using a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, as an alternative to the residual absorption peak. Density functional concept computations display that the residual absorption in the BGSe cry