The paper discusses the experimental results pointing to the efficient channel of the CO vibrational to the C-2 electronic energy transfer. The radiation spectra of the d(3)Pi(g), e(3)Pi(g), C-1 Pi(g) electronic states of C-2 molecule are investigated and the relation of their kinetics to a vibrational excitation of CO molecules in the He CO-O-2 plasma is discussed. The changes of CO vibrational energy distribution (VED) were imposed by an application of a laser resonator to the discharge tube under investigation. It was found that the modulation of laser radiation ( and VED) led to a similar changes of the spontaneous radiation from d(3)Pi(g), e(3)Pi(g) and C-1 Pi(g) states of C-2 molecules. (C) 2009 Elsevier B. V. All rights reserved.