1. Quantum Theory and Aplications Unit, Department of Physics, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
2. Department of Chemistry, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
3. University of Maroua, Maroua, Cameroon
4. Laboratoire de Spectroscopie Atomique Moléculaire et Applications, Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisie