1. Department of Physics, Federal University of Agriculture, Abeokuta 111101, Ogun, Nigeria
2. Department of Physics, Federal College of Dental Technology and Therapy, Enugu 400281, Enugu, Nigeria
3. Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa (UNISA), Pretoria 610101, South Africa
4. Department of Chemistry, Federal University of Agriculture, Alabata, Abeokuta 111101, Ogun, Nigeria
5. Department of Theoretical Chemistry, University of Duisburg-Essen, Universitätsstr. 2, D-45141 Essen, Germany