Dr. Manfred also presented at the 8th International Workshop on Plasma Spectroscopy in Oxford, UK. She gave an oral presentation on cavity ring-down Faraday rotation spectroscopy (CRD-FRS), a technique with close ties to cavity-based polarimetry. The technique is useful for selectively measuring paramagnetic species, such as the HO2 radical, since only molecules with a non-zero magnetic moment will exhibit the Faraday effect, causing a rotation in the polarization of intracavity light in the presence of an external magnetic field. A high sensitivity is achieved using a high finesse optical cavity. Dr. Manfred’s conference paper included HO2 measurements by a previous postdoctoral research as well as her new work on Verdet constants.