′�?, having a frequency of 295 cm−one, is attributed to your 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 functional idea computations clearly show that the residual absorption on the BGSe https://baga4se7crystal31740.blog-eye.com/32836096/a-secret-weapon-for-baga4se7-crystal