The 1-v″ bands progression of the B2Σ+ → X2Σ+ system of 12C17O+

The B2Σ+ → X2Σ+ (0-1, 2, 3, 4 progression) electronic transition of 12C17O+ was first observed and analyzed by Szajna and Ke¸pa [Spectrochim. Acta A 65 (2006) 1014-1020]. We have now extended our previous studies. The use of high resolution conventional spectroscopic techniques has allowed first rotational analysis of the 1-2, 1-3, 1-4 and 1-5 bands of the first negative system in the 37,000-43,000 cm−1 spectral region. Approximately 500 transition wavenumbers were measured with an estimated accuracy of 0.005 cm−1. The present data were combined with the previous measurements to yield an improved set of molecular constants for the B2Σ+(v′ = 0, 1) and X2Σ+(v″ = 1, 2, 3, 4, 5). The v′ = 1 and v″ = 5 vibrational levels were observed for the first time and the main molecular constants are (in cm−1, one standard deviation in parentheses)B2Σ+X2Σ+B1 = 1.710792(20)B5 = 1.825694(23)D1 = 7.799(15) × 10−6D5 = 6.085(21) × 10−6γ1 = 1.9491(37) × 10−2γ5 = [8.381] × 10−3The principal equilibrium molecular constants for the B2Σ+ and X2Σ+ states have also been derived and the vibrational terms values for the ground and excited states have been calculated.