′�?, with a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−one phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density functional theory computations clearly show which the residual absorption on the BGSe https://baga4se7crystal46790.qowap.com/92046490/a-secret-weapon-for-baga4se7-crystal