Herzberg band fluorescence from UV excitation of O2adsorbed on aerosol surfaces

摘要

The fluorescence spectra produced from KrF laser (248.5 nm) excitation of O2adsorbed on aerosol surfaces were observed. The aerosols were produced from the reaction of O3+C2H4or O3+C2H4+SO2in O2or N2in a gashyphen;flow reactor. The fluorescence spectra were identified as the O2(Athinsp;3sum;+u,Arsquo;thinsp;3Dgr;u, andcthinsp;1sum;minus;urarr;Xthinsp;3sum;minus;g) Herzberg systems. The molecular fluorescence intensity was greatly enhanced by the aerosol surface. The possible mechanisms for the enhancement of the observed fluorescence by surface are discussed.