1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
2. Department of Physics and Center for Materials Research, Norfolk State University, Norfolk, Virginia 23504, United States
3. Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
4. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
5. Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
6. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany
7. Department of Physics, University of Louisiana at Lafayette, Lafayette, Louisiana 70504, United States
8. Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States