Rate constants for the reactions OH+H2Srarr;H2O+SH and OH+NH3rarr;H2O+NH2over the temperature range 297ndash;427thinsp;deg;K

摘要

Rate constants for the reactions OH+H2Srarr;H2O+SH (k1) and OH+NH3rarr;H2O+NH2(k2) were determined over the temperature range 297ndash;427thinsp;deg;K by a flash photolysisndash;resonance fluorescence technique. The Arrhenius expressions obtained werek1= (5.2plusmn;0.5) times;10minus;12cm3moleculeminus;1secminus;1, independent of temperature (297ndash;424thinsp;deg;K);k2=2.93times;10minus;12eminus;(1710plusmn;300)/RTcm3moleculeminus;1secminus;1with rate constants at 298thinsp;deg;K ofk1= (5.25plusmn;0.53) times;10minus;12cm3moleculeminus;1secminus;1andk2= (1.64plusmn;0.16) times;10minus;13cm3moleculeminus;1secminus;1. These rate constants are compared and discussed with literature values.