HIGH-TEMPERATURE, HIGH-RESOLUTION LINE-POSITION MEASUREMENTS OF (CO2)-C-12-O-16 IN THE 580 CM-1 TO 940 CM-1 REGION

More than 6500 P, Q and R branch spectral lines in the region 580-940 cm-1 have been identified and assigned to 43 vibration-rotation bands of the principal isotope of carbon dioxide, (CO2)-C-12-O-16. The position of each line was measured and an uncertainty in the position of each line was estimated. The interferometric data used in this study were obtained from naturally occurring samples of carbon dioxide heated to 800 K, to yield. data on high quantum-number rotational, vibrational and vibrational angular momentum states. Measurements were made for three different sample pressures: 5, 15 and 40 torr. Measurements at 15 and 40 torr permitted the observation of weak, high quantum-number vibrational transitions normally not observed at room temperature and high-quantum-number rotational transitions within the vibrational transitions. A maximum unapodized instrumental resolution of 0.0044 cm-1 was used. A weighted linear least-squares procedure was applied to the spectral lines of each vibrational transition to estimate rotational-vibrational molecular constants G(v), B(v), D(v) and H(v) which are reported here.