Spectroscopy and perturbation analysis of the CO A${}^1\Pi -$X${}^1{\Sigma }^{+}$ (2,0), (3,0) and (4,0) bands

Abstract

The (2,0) (3,0) and (4,0) bands of the A${}^1\Pi -$X${}^1{\Sigma }^{+}$ system of ${}^{12}$C${}^{16}$O have been re-investigated by high-resolution vacuum ultraviolet absorption spectroscopy. A VUV Fourier-transform spectrometer, illuminated by synchrotron radiation, was applied to record a jet-cooled spectrum, a room temperature static gas spectrum and a high temperature (900 K) quasi-static gas spectrum, resulting in absolute accuracies of 0.01$-$0.02 cm${}^{-1}$ for the rotational line frequencies. Precise laser-based data were included in the analysis allowing for a highly accurate determination of band origins. Rotational levels up to $J=52$ were observed. The data were used to perform an improved analysis of the perturbations in the A${}^1\Pi$, $v=2$, $v=3$, and $v=4$ levels by vibrational levels of the D${}^1\Delta$, I${}^1{\Sigma }^{-}$, e${}^3{\Sigma }^{-}$, d${}^3\Delta$, and a${}^{\prime 3}{\Sigma }^{+}$ states.

12 pages, 4 figures, 5 tables, Molecular Physics (2015) accepted

References in corpus (4)

• The CO A-X System for Constraining Cosmological Drift of the Proton-Electron Mass Ratio
• Constraint on a varying proton-to-electron mass ratio from molecular hydrogen absorption toward quasar SDSS J123714.60+064759.5
• High-precision laser spectroscopy of the CO A${}^1\Pi$ - X${}^1{\Sigma }^{+}$ (2,0), (3,0) and (4,0) bands
• VUV-synchrotron absorption studies of N${}_2$ and CO at 900 K

Cited by in corpus (4)

• Constraint on a cosmological variation in the proton-to-electron mass ratio from electronic CO absorption
• Spectroscopy and perturbation analysis of the A${}^1\Pi$(v=0) state of ${}^{13}$C${}^{16}$O
• Fourier-transform spectroscopy of ${}^{13}$C${}^{17}$O and deperturbation analysis of the A${}^1\Pi$ ($\nu$ = 0 - 3) levels
• Precision spectroscopy and comprehensive analysis of perturbations in the $A{}^1\Pi (v=0$) state of ${}^{13}$C${}^{18}$O