1. Department of Physicochemistry of Solid Surfaces, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Skhdowska Sq. 3, 20-031 Lublin, Poland.
2. Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
3. Optical Fibre Laboratory, Faculty of Chemistry, Maria Curie-Sklodowska University. M. Curie-Sklodowska Sq. 3, 20-031 Lublin. Poland.