Analysis of structural and optical properties of annealed fullerene thin films M. M. El-Nahass, H. A.M. Ali, A.-S. Gadallah, M. Atta Khedr and H. A. Afify Eur. Phys. J. D, 69 8 (2015) 200 Published online: 21 August 2015 DOI: 10.1140/epjd/e2015-60174-8