Direct analysis of oxidizing agents in aqueous solution with attenuated total reflectance mid-infrared spectroscopy and diamond-like carbon protected waveguides - Beutl, Michael.; Janotta, Markus.; Lackner, Jorgen M.; Mizaikoff, Boris.; Stotter, Christoph.; Vogt, Frank.; Voraberger, Hannes-Stefan.; Waldhauser, Wolfgang.