Van den Bergh, H.Troe, J.2011-02-012011-02-012011-02-01197610.1063/1.432220https://infoscience.epfl.ch/handle/20.500.14299/63604The recombination of I atoms after laser flash photolysis was studied in the presence of NO or NO2 at 320-450 DegK and 0-200 atm of He. The reaction proceeds in 2 stages. The 1st stage is governed by the recombination I + NO (+He) -> INO (+He) or I + NO2 (+He) -> INO2 (+He), for which the full falloff curves are derived. The 2nd stage is governed either by reaction between 2 INO (or INO2) mols., or, at higher temps., by thermal decompn. of INO (or INO2). The reaction involves the elementary steps of a typical intermediate complex mechanism of atom recombination. The rates of all of these elementary steps can be sepd. From the I + NO .dblarw. INO and I + NO2 .dblarw. INO2 equil. consts. the enthalpies of formation of INO and INO2 of DHf0298(INO) = 29.0 +- 1 kcal mole-1 and DHf0298(INO2) = 14.4 +- 1 kcal mole-1, resp., are derived.15465-40-4P58585-94-7P Role: PREP (Preparation) (formation and reactions ofkinetics and thermodn. of)10102-43-910102-44-0 Role: RCT (Reactant)RACT (Reactant or reagent) (with iodine atomskinetics and thermodn. of)14362-44-8 Role: RCT (Reaciodine atom recombination catalysisnitric oxide reaction iodine atomnitrogen dioxide reaction iodine atomentropy iodine atom nitrogen oxideenthalpy iodine atom nitrogen oxidetext::journal::journal article::research article