1. School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
2. Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
3. Departamento de Física, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
4. School of Biology, Chemistry and Forensic Science, University of Wolverhampton, Wolverhampton WV1 1LY, United Kingdom
5. Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
6. Départment de Chimie, Université de Liège, Institut de Chimie-Bât. B6C, B-4000 Liège 1, Belgium
7. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
8. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
9. Photon Science Institute, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
10. Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia