Spectroscopy and perturbation analysis of the A${}^1\Pi$(v=0) state of ${}^{13}$C${}^{16}$O

Abstract

The lowest $v=0$ level of the A${}^1\Pi$, state of the ${}^{13}$C${}^{16}$O isotopologue of carbon monoxide has been reinvestigated with a variety of high resolution spectroscopic techniques. The A${}^1\Pi -$X${}^1{\Sigma }^{+}(0,0)$ band has been studied by vacuum-ultraviolet Fourier-transform absorption spectroscopy, using the SOLEIL synchrotron as a radiation source. Spectra were obtained under quasi-static gas conditions at liquid-nitrogen temperature, room temperature and at an elevated temperature of 900 K, with absolute accuracies of 0.01$-$0.03 cm${}^{-1}$. Two-photon Doppler-free laser spectroscopy has been applied to a limited number of transitions in the A${}^1\Pi -$X${}^1{\Sigma }^{+}(0,0)$ band, under collision-free circumstances of a molecular beam, yielding an absolute accuracy of 0.002 cm${}^{-1}$. The third technique is high-resolution Fourier-transform emission spectroscopy in the visible region applied to the B${}^1{\Sigma }^{+}-$A${}^1\Pi (0,0)$ band in a gas discharge, at an absolute accuracy of up to 0.003 cm${}^{-1}$. With these methods rotational levels of A${}^1\Pi (0)$ could be studied in both parity components up to a rotational quantum number of $J=46$. The frequencies of 397 transitions were used to analyse the perturbations between the A${}^1\Pi (0)$ level by vibrational levels of the D${}^1\Delta$, e${}^3{\Sigma }^{-}$, d${}^3\Delta$, and a${}^{\prime 3}{\Sigma }^{+}$ states.

16 pages, 6 figures, 5 tables

References in corpus (3)

• The First Positive Detection of Molecular Gas in a GRB Host Galaxy
• The Relationship Between the Dust and Gas-Phase CO Across the California Molecular Cloud
• High-precision laser spectroscopy of the CO A${}^1\Pi$ - X${}^1{\Sigma }^{+}$ (2,0), (3,0) and (4,0) bands

Cited by in corpus (1)

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