′�?, using a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional principle computations present which the residual absorption in the BGSe https://baga4se7-crystal75174.daneblogger.com/31931484/a-secret-weapon-for-baga4se7-crystal