Knowledge Bank

We have developed a technique for obtaining broad scans, $>$100cm$^{-1}$, for jet cooled cavity ringdown spectroscopy $($CRDS$)$ spectra. Previously the scans of the jet cooled, CRDS apparatus were limited to $&lt;$10cm$^{-1}$ due to the use of a narrow linewidth radiation source. However, by coupling our jet cooled, CRDS apparatus with a moderate resolution~($\simeq$ 0.05 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$) dye laser we are able to greatly increase our rate of data acquisition thereby gaining the capability to perform broad spectral surveys of jet cooled molecules. As a test of the capabilities of the technique we have scanned the $A~$--$X~$ transition of NO$3$ previously reported by Deev \emph{et al.} at room temperature. We believe that this will be a very useful technique to search for transitions of cold molecules whose frequencies are not well known and which later can be studied using high resolution methods.