The absorptivity of CO2 and O2 at 193 nm over the temperature range of 900-1600°C is reported. The data were collected in a flowtype tube furnace using an ArF excimer laser at the light source. CO2 was mixed at 5% by volume in N2 and O2 was examined at 5% and 10%. The internal transmittance of a 1-meter externally heated absorption cell was measured. The results establish a value for the absorptivity, α, for CO2 ranging as high as 2.35 × 10-19 cm2/molecule at 1600°C. For O2, the absorptivity is 1.81 × 10-19cm2/molecule at 1600°C. The results partially agree with those reported in the literature recently by others at 1000°C and 193 nm and extend those data to higher temperatures; however, the agreement is far from exact. The results are inconsistent with the higher temperature, 1500-2500°C, values inferred by others from indirect measurements for these two species.
Steven F. Rice and Russell G. Hanush, "Absorptivity of Carbon Dioxide and Molecular Oxygen at 193 nm at High Temperatures up to 1600°C," Appl. Spectrosc. 56, 1621-1625 (2002)