INTEGRATED INTENSITY MEASUREMENTS ON THE FUNDAMENTAL AND FIRST OVERTONE BAND SYSTEMS OF CO BETWEEN $2000^{\circ}$ AND $5000^{\circ}K$.

This work was supported by Project DEFENDER, Advanced Research Project Agency, AO363, through the Air Force Cambridge Research Laboratories, AF19(628)-4360.Author Institution: Space Science Laboratory, Mail Zone 596-00, General Dynamics/ConvairMeasurements have been made of the total absolute integrated intensities of the fundamental and first overtone band systems of CO at various temperatures within the range $2000^{\circ}$ to $5000^{\circ}K$. The CO gas sample was studied in emission using a reflected shock wave technique to raise the sample to the high temperatures. The experiment determines the total integrated band emission as a function of optical pathlength. For optically thin gases, the integrated emission is related to the integrated intensity in a simple fashion. Within the temperature range used in the present experiment, the integrated intensity of the CO fundamental band system remains constant. However, the integrated intensity of the CO first overtone band system shows a very small increase with increasing temperature. The temperature dependencies of the two band systems are in agreement with the theoretical temperature dependencies determined assuming a harmonic oscillator approximation to the CO molecule