Properties of molecular radicals with atmospheric relevance created in our experiment are measured spectroscopically. In order to enhance detection sensitivity we implemented the continuous wave cavity ring-down spectroscopy (cw-CRDS) technique.
It enhances sensitivity by increasing effective path length through the sample while keeping small detection volume - contrary to other multi pass methods. Implementation of this method is described in this article along with approach taken to couple the cw-CRDS with the pulsed radical source and computer methods for data acquisition and processing of the measured data.