′�?, which has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, rather than the residual absorption peak. Density purposeful principle computations display that the residual absorption in the BGSe https://cesariwkvh.blue-blogs.com/39881684/a-secret-weapon-for-baga4se7-crystal