The UV-visible absorption cross-sections of IONO2

[摘要] The UV-visible absorption spectrum of gaseousIONO₂ has been measured over the wavelength range 245--415 nm using the technique of laser photolysis with time-resolvedUV-visible absorption spectroscopy. IONO₂was produced in situ in the gas phase by laser flash photolysis of NO₂/CF₃I/N₂ mixtures. Post flash spectra were deconvolved toremove contributions to the observed absorption from other reactant and product species.The resulting spectrum attributed to IONO₂consists of several overlapping broad absorption bands. Assuming a quantum yield of unity forIONO₂photolysis, model calculations show that during sunlit hours at noon,53° N, the first order solar photolysis rate coefficient (J value) for IONO₂is 4.0 x 10^-2 s^-1.

[学科分类] 大气科学