1. American University of Beirut, Faculty of Arts and Sciences, Department of Chemistry, P. O. Box 11-0236, Riad El Solh, 1107-2020 Beirut, Lebanon
2. Lebanese Atomic Energy Commission, CNRS, Research and Development Department, P. O. Box 11-8281, 1107-2260 Riad EL Solh, Beirut, Lebanon