Density functional theory study of the carbon chains CnX, CnX+ and CnX- (X = O and Se; n = 1–10) A. Bundhun and P. Ramasami Eur. Phys. J. D, 57 3 (2010) 355-364 Published online: 23 March 2010 DOI: 10.1140/epjd/e2010-00069-8