Oscillator strength calculations in color centers of diamond and the role of spin Mehdi Heidari Saani, Mohammad Ali Vesaghi and Keivan Esfarjani Eur. Phys. J. B, 39 4 (2004) 441-446 Published online: 23 July 2004 DOI: 10.1140/epjb/e2004-00215-9