Iodine and bromine resonance lamps in atmospheric research

摘要

For the first time previously developed iodine resonance spectra source has been tested in flash photolysis experiment. Quantitative measurements of concentration kinetics of iodine atomic species in a I_2+O_3 system are possible. The 183.038 nm resonance absorption transition of I(~2P_(3/2)) in previously developed EDL has been studied; dependence of self-absorption and self-reversal on iodine partial pressure in the discharge volume has been measured. The search for optimal conditions for an iodine EDL with minimized self-absorption and sufficient intensity were made. In condition of flash photolysis with previously described method it is possible to determine the emission temperature, oscillator strength and corresponding absorption cross section for the I(~2P_(3/2)) transition at 183.038 nm. With special set-up shown here it is possible to use the continuous light sources for absorption spectroscopy of molecular iodine species together with atomic iodine line soruce for resonance absorption spectroscopy of atomic iodine sepcies. There are evidences that bromine sources could be used in similar ways.