Biography The author graduated from King Saud University with a degree of B.Sc. in general chemistry in 1984. Then he worked as a researcher at King Abdulazize City for Science and Technology. In 1988 he obtained an M.Sc. also from KSU. Between 1988 and 1990 he worked in the radiation protection program at KACST. Between 1990 and 1995, the author has been engaged in research in the Department of Chemistry, Manchester University leading to obtained the degree of Ph.D. in 1995. Then he worked in research at King Abdulazize City for Science and Technology up to now.