′�?, using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density useful concept computations show which the residual absorption on the BGSe crystal https://baga4se7crystal97005.targetblogs.com/32968266/5-tips-about-baga4se7-crystal-you-can-use-today