1. Institute of Mathematic and Physical Sciences (IMSP), Dangbo, Benin
2. University of Abomey-Calavi, Department of Physics, Calavi, Republic of Benin
3. UNSTIM, ENS-Natitingou, Laboratory of Physics and Applications (LPA), Abomey, Benin
4. Erciyes University, Department of Physics, 38039, Kayseri, Turkey