By preparing CO2+ ions in the X-2 Pi(g,1/2)(000) state via [3 + 1] multiphoton ionization of CO2 molecules at 333.06 nm, we have obtained the mass-resolved [1 + 1'] two-photon dissociation spectra of CO2 via the C-2 Sigma(+)(g) (upsilon(1), upsilon(2), 0) <- B-2 Sigma(+)(u)(000)/A(2)Pi(u,1/2)(000; 100) <- X-2 Pi(g,1/2)(000) transitions by fixing the first dissociation laser at 289.77 nm, 351.24 nm, 337.90 nm to excite the CO2+ to B-2 Sigma(+)(u) (000), A(2)Pi(u,1/2) (000), A(2)Pi(u,1/2)(100) state, separately, and scanning the second dissociation laser in the wavelength range of 557-759 nm. The original CO2+(C-2 Sigma(+)(g) (000)) position of 45120 +/- 3 cm(-1) above CO2+(X-2 Pi(g,1/2)(000)) and the spectroscopic constants of nu(1) = 1400 +/- 5 cm(-1), nu(2) = 620 +/- 8 cm(-1) and nu(3) = 2909 cm(-1) for CO2+ (C-2 Sigma(+)(g)) are deduced from the C-2 Sigma(+)(g)(nu(1), nu(2), 0) <- B-2 Sigma(+)(u)(000)/A(2)Pi(u,1/2)(000; 100) <- X-2 Pi(g,1/2)(000)) transition data. The dependence of the product branching ratios [CO+]/[O+] of CO2+(C-2 Sigma(+)(g)) on the vibration levels has been observed and the dissociation dynamics of CO2+ via C-2 Sigma(+)(g) state is discussed. (C) 2009 Elsevier B.V. All rights reserved.