Fourier-transform spectroscopy of ${}^{13}$C${}^{17}$O and deperturbation analysis of the A${}^1\Pi$ ($\nu$ = 0 - 3) levels

Abstract

The high-resolution B${}^1{\Sigma }^{+}$ - A${}^1\Pi$ (0, 0) and (0, 3) emission bands of the less-abundant ${}^{13}$C${}^{17}$O isotopologue have been investigated by Fourier-transform spectroscopy in the visible region using a Bruker IFS 125HR spectrometer at an accuracy 0.003 cm${}^{-1}$. These spectra are combined with high-resolution photoabsorption measurements of the ${}^{13}$C${}^{17}$O B${}^1{\Sigma }^{+}$ $\leftarrow$ X${}^1{\Sigma }^{+}$ (0, 0), B${}^1{\Sigma }^{+}$ $\leftarrow$ X${}^1{\Sigma }^{+}$ (1, 0) and C${}^1{\Sigma }^{+}$ $\leftarrow$ X${}^1{\Sigma }^{+}$ (0, 0) bands recorded with an accuracy of 0.01 cm${}^{-1}$ using the vacuum ultraviolet Fourier-transform spectrometer, installed on the DESIRS beamline at the SOLEIL synchrotron. In the studied 17,950 - 22,500 cm${}^{-1}$ and 86,800 - 92,100 cm${}^{-1}$ regions, 480 transitions have been measured. These new experimental data were combined with data from the C $\to$ A and B $\to$ A systems, previously analyzed in 13C17O. The frequencies of 1003 transitions derived from 12 bands were used to analyze the perturbations between the A${}^1\Pi$ ($\nu$ = 0 - 3) levels and rovibrational levels of the d${}^3{\Delta }_i$, e${}^3{\Sigma }^{-}$, a${}^{\prime }{}^3{\Sigma }^{+}$, I${}^1{\Sigma }^{-}$ and D${}^1\Delta$ states as well as to a preliminary investigation of weak irregularities that appear in the B${}^1{\Sigma }^{+}$ ($\nu$ = 0) level. Deperturbed molecular constants and term values of the A${}^1\Pi$ state were obtained. The spin-orbit and L-uncoupling interaction parameters as well as isotopologue-independent spin-orbit and rotation-electronic perturbation parameters were derived.

37 pages, 8 tables, 7 figures, 91 references

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