Theoretical studies on structures and electronic spectra of linear carbon chains C2nH+ (n = 1−5)

National Science Foundation of China [20673087, 20733002, 20473062, 20423002]; State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University) [200306]; Natural Science Foundation of Henan Province [0311011200, 200510475012]; Ministry of Science and Technology [2004CB719902]