Radical density measurements in an atmospheric pressure oxyacetylene torch

摘要

We used highly sensitive absorption spectroscopy to quantify molecular radicals in the gas phase of an oxyacetylene torch diamond growth system. We measured column densities of C2, CH, CN and OH as a function of position in the flame for several different flame mixtures. We derived the flame gas kinetic temperature from the C2 Swan band spectra. We searched for CH3, singlet C2, and C3 and established upper limits on the column densities of these radicals. The results were qualitatively correlated with diamond growth as judged by Raman spectra and scanning electron microscopy. The column densities of C2 and CH correlate best with the growth of diamond.