In our work , we reported the estimation method for calculating the optical band gap and determining the type of inter band transition. The empirical fitting of experimental data to the law requires the assumption of a value for (3/2 , 1/2 , 2 , 3 )
Dear Abul Hasnat Rubel, thank you for your answer , I'm not using any built in programming , The purpose of our question is to report simple numerical technique that may be used for the interpretation of experimental data on absorption spectra on a more precise method.