1. Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0697, USA
2. Department of Applied Physics & Materials Science, and MIRA, Northern Arizona University, Flagstaff, Arizona 86011, USA
3. Aix-Marseille University, CNRS, CINAM, Marseille, France and European Theoretical Spectroscopy Facility,