FT-UV emission spectroscopy of the 0-v " progression bands of the B 2 I + - X 2 I + system of 12 C 16 O +

We report an experimental investigation of the 0 - v '' progression bands of the First -Negative (B 2 I + - X 2 I + ) system of 12 C 16 O + . The ultraviolet wavelength emission spectrum of CO + was generated using an air-cooled stainless steel hollow-cathode discharge lamp filled with a mixture of CO 2 and Ne. The study includes four bands, i.e. 0-0, 0-1, 0-2 and 0-3, observed in emission with a high-resolution Fourier-transform spectrometer in the 38 500-46 000 cm -1 region. In total, 541 ro-vibronic transitions have been measured with an absolute accuracy of 0.005-0.010 cm -1 . The experimental data were analyzed using the PGOPHER program, which resulted in a set of high accuracy molecular constants and ro-vibronic level positions for the X 2 I + , v = 0 - 3 and B 2 I + , v = 0 levels. The current values of the band origins have been compared with historical data, including the most recent results obtained by Ventura et al. (2020) and the discrepancies pointed out by the authors were explained.