Reactions of atomic carbon C(23PJ) by kinetic absorption spectroscopy in the vacuum ultra-violet

Abstract

Time-resolved attenuation of the atomic emission transition C(3³P^°_J→2³P_J) at 166 nm has been used to study the reactions of C(2³P_J). The decay of this atom, following its generation by the vacuum ultra-violet flash photolysis of carbon suboxide, has been monitored directly in the presence of a number of gases. The following rate data for 300 K have been obtained: C(2³P_J)+ NO →CN + O, k= 7.3±2.2 × 10^–11 cm³ molecule^–1 s^–1, C(2³P_J)+ O₂→CO + O, k= 3,3±1.5 × 10^–11 cm³ molecule^–1 s^–1, C(2³P_J)+ N₂O →CO + N₂, k= 2.5±1.6 × 10^–11 cm³ molecule^–1 s^–1, or CN + NO, C(2³P_J)+ H²O →CO + H²k⩽3.6 × 10^–13 cm³ molecule^–1 s^–1, or CH₂O, C(2³P_J)+ CO₂→2CO, k≤ 10^–14 cm³ molecule^–1 s^–1, C(2³P_J)+ CH₄→C₂H₄, k < 2 × 10^–15 cm³ molecule^–1 s^–1, C(2³P_J)+ N₂+ M →CN₂+ M, k= 3.1±1.5 × 10^–33 cm⁶ molecule^–2 s^–1(M = Ar), C(2³P_J)+ H₂+ M →CH₂+ M, k= 7.1±2.5 × 10^–32 cm⁶ molecule^–2 s^–1(M = He), C(2³P_J)+ CO + M →C²O + M, k= 6.3±2.7 × 10^–32 cm⁶ molecule^–2 s^–1(M = He).