Figure 3 where fis the fitness function, n is the number of atoms, ACpesr and Re,., are coefficient values regarding posi- iONpest. The Orbital-Tuner is an additional approach for eliminating the need for using initially set parameters along all iterations for a solution process. Based on the algorithmic steps, flow chart of the ES algorithm is shown in Fig. 3 [59]. nucleus, positionpes is the best nucleus position (for now), électronpes, is the best electron, as around the nucleus, pOsitiOnney, is the new position for the nucleus, Ac; is the accelerator coefficient, Re; is the Rydberg’s energy constant-coefficient. In the context of the Eq. 2, @ means the vector multiplication. The related calculations in this stage are for realizing the atom movements toward the global optimum. Re and Ac are also re-calculated via an in-system optimization stage, which is called as the Orbital-Tuner. That is done if the stopping criteria is not met, by considering the follows (their values are set randomly at the first iteration): where fis the fitness function, n is the number of atoms,