1. Faculty of Technical
Physics, Poznan University of Technology, Piotrowo 3, 60-965 Poznań, Poland
2. Institute of Low Temperature and Structure Research of Polish Academy of Sciences, Okólna
2, 50-422 Wrocław, Poland
3. College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, 2 Chongwen Road, Nan’an District, Chongqing 400065, P.R. China
4. Institute of Physics, University of Tartu, W. Ostwald Str. 1, Tartu 50411, Estonia
5. Institute of Physics, Jan Długosz University, Armii Krajowej 13/15, 42-200 Częstochowa, Poland
6. Faculty
of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland