A study of three dimol emissions of singlet oxygen, O2(1Δg), using a discharge flow shock tube

Abstract

By measuring the intensity ratios of the three dimol emissions of oxygen (¹Δ_g), we have been able to determine their relative emissivities and estimate rate constants for the emissions between 650 and 1650 K.

When the variation of the emissions at 634 and 703 nm with temperature is examined, the intensity depends, to a first approximation, on the product of density and temperature, ρ²T^½, indicating that the reactions are basically collisional, but more detailed examination shows that above 1100 K there is an enhancement in the emission, which increases with temperature.

The ratio of the intensities at 579 and 634 nm, from the v= 1 and v= 0 vibrational levels of O₂(¹Δ_g) in the oxygen flow at room temperature, indicates that at the exit of the microwave discharge the amount of vibrational excitation is equivalent to a temperature of 750 ± 50 K.