Knowledge Bank

The molecules were produced by a microwave discharge through $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C16O$ or $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C16O+\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C16O$ mixtures. The spectra were recorded in Laboratoire Aim'e Cotton (Orsay) by high resolution Fourier transferm spectroscopy. Very strong perturbations (greater than $10cm-1$) were deteceted during the rotational analysis of the Asundi system. The vibrational levels $v=0,1,3$, of the $a13\Sigma +$ state interact respectively with the $a3\Pi v=4,5,6$, levels. The theoretical model we have used inculde second order spin-orbit and spin-rotation interactions parameters in order to reproduce the observed perturbed wavenumbers to the F.T.S. accuracy (about $0.003cm-1$). A similar work was performed for the Ballik-Ramsay system interactions. For the three molecules, about 11600 wavenumbers were reduce with a $0.003cm-1$ R.M.S. Accurate molecular constants and interaction parameters were $derived1,2$. The variation of the electronic parameters with internulear distance will be discussed. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ C. Amiot and K. Islami, J. Mol. Spectrosc. (to appear) 2 K. Islami and C. Amiot, J Mol. Spectrose. (to appear).