1. National Aerospace University “KhAI,” Kharkov,
Ukraine
2. School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia
3. Institute of Experimental and Applied Physics, University Kiel, D-24098 Kiel, Germany
4. The George Washington University, Washington,
DC 20052, USA
5. Jozef Stefan Institute, Ljubljana,
Slovenia
6. Plasma Sources and Applications Centre, NIE, Nanyang Technological University, Singapore