Knowledge Bank

The electronic transition moments of $C2$ band systems in the spectral region 0.2 - 1.2 microns have been measured. The measurements were made in emission behind incident shock waves in $C2H2$ - Argon mixtures. The shock velocities were approximately 4.5 km/sec which resulted in post-shock temperatures of about $6000\circ K$. Narrow passband radiometers were used to obtain absolute measurements of shock excited $C2$ radiation from which absolute electronic transition moments are derived. The results are:[FIGURE]