Knowledge Bank

New high resolution IR spectra of the $\nu 10/\nu 7/\nu 4$ region, lying from 600 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ to 1200 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ have been recorded in Brussels. They are used simultaneously with a previous spectrum of the $\nu 12$ band, also recorded in Brussels, to perform the analysis of the $\nu 10/\nu 7/\nu 4/\nu 12$ region, lying from 600 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ to $1500$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$. Following our work devoted to the $\nu 12$ band considered as isolated, we performed a frequency re-analysis of the $\nu 10/\nu 7/\nu 4/\nu 12$ infrared tetrad in the $600-1500$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ region, thanks to the tensorial formalism developed in Dijon for X$2$Y$4$ asymmetric-top molecules, {\bf 217} 239--248 (2003).} and the XTDS software package, {\bf 251} 102--113 (2008). }. Including the strong Coriolis interaction affecting the upper vibrational levels $101$, $71$, $41$ and $121$, a total of $11727$ lines have been assigned and fitted as a tetrad with a global root mean square deviation of $0.338\times 10-3$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$.