1. Physics Department, Mansoura University, Mansoura 35516, Egypt
2. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3111, United States
3. Department of Electrical Engineering, South Dakota State University, Brookings, South Dakota 57007, United States
4. X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States