Quenching of infra-red chemiluminescence. Part 2.—Rates of energy transfer from HCl(v⩽ 3) to HBr, HCl and CO2

Abstract

The intensity of the HCl infra-red chemiluminescence from the reactions, Cl + HBr → HCl + Br and Cl + HI → HCl + I, has been studied as a function of the concentration of added HBr, HCl and CO₂. Using a steady-state analysis, rate coefficients have been determined for the following 6 processes: HCl (v= 1)+ HBr (v= 0)→ HCl (v= 0)+ HBr; HCl (v= 2 and 3)+ HCl (v= 0)→ HCl (v– 1)+ HCl; HCl (v= 1, 2 and 3)+ CO₂(000)→ HCl (v– 1)+ CO₂. The results indicate that in all cases relaxation occurs predominantly by vibrational-vibrational energy exchange.