Research on Chemical Lasers.
Final technical rept. 1 Jan 69-30 Jun 70,
CORNELL AERONAUTICAL LAB INC BUFFALO NY
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The objective of the research was the investigation of possible over-population in the electronic states of AlO as a result of a chemical reaction. Simultaneous radiation measurements of the absorption and emission intensities associated with electronic transitions of AlO near 3035 angstroms and 4845 angstroms were performed by heating aluminum droplets in an Ar and O2 atmosphere in a shock tube. While large overshoots in the emission intensity were observed, the absorption measurements indicated that the population of the excited states always remained in equilibrium with the ground state population. Measurements made with Al2O3 particles indicate that the pure Al particles are completely oxidized prior to shock tube firing. The evaporation of Al2O3 behind the incident shock wave produces AlO. If the concentration of this product is greater than that required for equilibrium, an overshoot in the AlO concentration occurs. Experiments were also performed in a discharge tube with hydrogen chloride and deuterium fluoride. The discharge tube was cooled to enhance the possibility of obtaining an inverted population in the upper vibrational levels as a result of vibration-vibration energy exchange. Experiments were performed over a range of partial pressures and discharge currents, lasing action was not observed. Author
- Lasers and Masers