1. Faculty of Technical Physics, Poznań University of Technology Piotrowo 3, 60-965 Poznań, Poland
2. Institute of Molecular Physics, Polish Academy of Sciences Smoluchowskiego 17, 60-179 Poznań, Poland
3. Université du Littoral - Côte d'Opale, LEMCEL, BP 689, 62-228 Calais, France