1998 Volume 41 Issue 4 Pages 951-958
A series of experiments regarding the ignition of H2-O2-O3 / H2-O2-O3-Ar mixture with KrF excimer laser has been carried out. We investigated the influences of some factors upon the Minimum Incident Laser Energy Intensity(MILEI) for the ignition, and took schlieren photographs with an image converter camera to observe the photolysis and ignition process. The results of these works showed that ozone was a strong and unique absorber for the focused KrF laser light and suggested that the photolysis of ozone induced the ignition. In our experimental range, the MILEI decreased with the increase of ozone concentration, dilution with argon and preheating of the mixture. However, a weak dependence of MILEI on the equivalence ratie of H2-O2-O3 mixtures was measured. From the schlieren photographs, we observed the rapid growth of the initial ignition kernel and the formation of shock wave. These observations suggested that the ignition process was considerably faster than the one induced by the photolysis of O2 with ArF laser.