1. Department
of Micro and Nanotechnology, Middle East Technical University, 06800, Ankara, Turkey
2. Institute
of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
3. CAMECA Instruments Inc., Madison, Wisconsin 53711 United States
4. Department
of Physics, Middle East Technical University, 06800, Ankara, Turkey
5. Department
of Physics, Akdeniz University, 07058, Antalya, Turkey
6. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
7. Dipartimento
di Scienze Chimiche e Farmaceutiche, Universita di Trieste, Via L. Giorgieri
1, 34127 Trieste, Italy