Infra-red chemiluminescence from vibrationally excited CO. Part 3.—Reaction of O atoms with CSe2

Abstract

Two sets of experiments have been carried out on the reaction of atomic oxygen with CSe₂. By flash photolysis mixtures of NO₂+ CSe₂ with light of wavelengths > 320 nm, it has been shown that the primary reaction is O + CSe₂→SeO + CSe, with a rate coefficient ≳ 2 × 10^–12 cm³ molecule^–1 s^–1. When CSe₂ was mixed with an excess of O atoms in a flow system, vibrationally excited CO(v⩽20) was produced in the secondary reaction O + CSe→CO + Se. Vibrational distributions were determined from the first overtone CO emission spectra, and some of the relative rates at which CO is produced in different levels (R_v) were derived using a steady state analysis: R₁₀∼0.25; R₁₁= 0.4; R₁₂= 0.45; R₁₃= 0.60; R₁₄= 0.66; R₁₅= 0.72; R₁₆= 0.82; R₁₇= 0.89; R₁₈= 1.0; R₁₉= 0.73; R₂₀∼0.2. The results are compared to those for the analogous reaction between O and CS.