′�?, by using a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 295 cm−one phonon corresponds towards the crystal IR absorption edge, rather than the residual absorption peak. Density functional concept computations display which the residual absorption from the BGSe https://devinzhfhg.theblogfairy.com/32021357/a-secret-weapon-for-baga4se7-crystal