TY - JOUR AU - Rui-Hua Xie AU - Garnett W. Bryant AU - G Sun AU - M Nicklaus AU - V Smith AU - Y Araki AU - O Ito C2 - Journal of Chemical Physics DA - 2008-10-16 14:10:14 LA - en M1 - 120 PB - Journal of Chemical Physics PY - 2008 TI - Excitations, Optical Absorption Spectra, and Optical Excitonic Gaps of Heterofullerenes: I. C60, C59N+ and C48N12 ER -