FT spectroscopy of the Comet-Tail system in 12C17O+: Deperturbation analysis of the A2Πi(v=0) level

Abstract

The first recording of the $0-v^{\prime \prime }$ progression $(v^{\prime \prime }=0,1,2,3)$ in the emission spectrum of the Comet-Tail ($A^2{\Pi }_i\to X^2{\Sigma }^{+}$) system in the ${}^{12}{C}^{17}{O}^{+}$ molecule was performed. Using a high-resolution Fourier-transform spectrometer, in the region of 12 880 – 20 500 cm⁻¹ nearly 1900 lines were measured with an accuracy of 0.02 cm⁻¹. As a result of the spectral analysis, 20 molecular parameters of the A$(v=0)$ and X$(v=0,1,2,3)$ levels were determined, including the parameters of the $A^2{\Pi }_i(v=0)\sim X^2{\Sigma }^{+}(v=10)$ perturbation of a complex, spin–orbit, spin-electronic and rotation-electronic ($L-$uncoupling) nature. In addition, the values of the rovibronic terms of the $A^2{\Pi }_i(v=0)$ level were also determined and the fractional ${}^2\Pi$ character of the $A^2{\Pi }_i(v=0)$ and $X^2{\Sigma }^{+}(v=10)$ levels was examined.