Knowledge Bank

A set of 14 spectra of the carbon dioxide absorption bands in the 4300 to 4700 $cm-1$ region were obtained with a BOMEM DA3.002 FTS and a White cell using absorption path lengths between 507 and 1307 meters. The principal purpose of this work was to make the first laboratory measurements of the transition moment and Herman-Wallis intensity parameters of the $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C16O2$ $(311O)IV-(00\circ 00)$ band at $4416.15cm-1$. This weak band was recently found to be prominent in the thermal emission spectrum of the dark side of $Venus1$. Our measured rotationless transition moment of this band is $R2=(1.41\pm 0.14)$ $x10-11$ $Debye2$. Line positions for this band were calibrated using the 2-0 $band2$ of CO. The spectra of CO and $CO2$ were recorded simultaneously with a small amount of added CO to the $CO2$. In this spectral region we have also recorded data which is suitable for intensity and positional work on the $(3110)III-(00\circ 0)$, $(3220)III-(0110)$ and $(40\circ 0)IV-(0110)$ bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C16O2$ and the $(00\circ 2)I-(00\circ 0)$ band of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C16O18O$.