1. Institute of Atomic and Molecular Physics, Jilin University 1 , Changchun 130012, People's Republic of China
2. College of Physics, Jilin University 2 , Changchun 130012, People's Republic of China
3. Helmholtz-Institut Jena 3 , D-07743 Jena, Germany
4. GSI Helmholtzzentrum für Schwerionenforschung GmbH 4 , D-64291 Darmstadt, Germany
5. College of Physical Science and Technology, Shenyang Normal University 5 , Shenyang 110034, People's Republic of China
6. Chemistry Program, Centre College 6 , Danville, Kentucky 40422, USA
7. Institute of Atomic and Molecular Sciences, Academia Sinica 7 , Taipei 10617, Taiwan, Republic of China
8. Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena 8 , D-07743 Jena, Germany