The B2Σ+−X2Σ+, 0−ν′′ progression of 12C17O+ reinvestigated by FT-UV emission spectroscopy

Abstract

The emission spectrum of the ${\text{B}}^2{\Sigma }^{+}-{\text{X}}^2{\Sigma }^{+}$ system of the less abundant ¹²C¹⁷O${}^{+}$ isotopologue has been recorded at high resolution in the ultraviolet wavelength region using a Fourier transform spectrometer. The ¹²C¹⁷O${}^{+}$ molecules were produced and excited in a graphite hollow-cathode discharge lamp, in the presence of approximately 0.2 Torr of isotopically enriched molecular oxygen ¹⁷O₂. The study includes four bands, i.e. $0-0$ (analyzed for the first time) and $0-1$, $0-2$, $0-3$ (reanalyzed), covering over 500 ro-vibronic transitions measured with an absolute accuracy of 0.0060–0.0100 cm⁻¹. A rotational analysis of these bands was performed using the PGOPHER program, and molecular constants for the ${\text{B}}^2{\Sigma }^{+}$, $\nu =0$ and ${\text{X}}^2{\Sigma }^{+}$, $\nu =0-3$ levels were extracted.