1. Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS, Université de Strasbourg, Strasbourg F-67034, France
2. Department of Pharmaceutical Physics-Biophysics, Faculty of Pharmacy, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca 400349, Romania
3. Faculty of Physics, “Babes-Bolyai” University, Cluj-Napoca 400084, Romania