Effect of Coulomb term on optical properties of fluorine

In this work, the optical properties of fluorine have been theoretically investigated. The Woods–Saxon potential model has been considered together with the spin–orbit interaction term. Then, the Schrödinger equation is solved by employing the Nikiforov-Uvarov method without and with considering the Coulomb term. We determine refractive index changes (RIC) and absorption coefficient (AC) of the fluorine with and without considering the Coulomb term. We found that (i) the RIC increases and shifts toward higher energies considering the Coulomb term. (ii) AC raises and moves to higher energies considering the Coulomb term. We also deduced that the Coulomb term has an important effect on the optical properties of fluorine.