High-temperature argon broadening of CO2 near 2190 cm−1 in a shock tube
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© 2017, Springer-Verlag GmbH Germany. Scanned-wavelength laser absorption measurements of CO2diluted in Ar were performed behind reflected shock waves at high temperatures (1158–2017 K) and low pressures (5.1–108.4 kPa). High-resolution (0.001 cm−1) scans were conducted in 0.4-cm−1increments from about 2188.8 to 2191.8 cm−1at a scan rate of 2 kHz. The HITRAN 2004, HITRAN 2012, and CDSD-296 databases were all found to underestimate the absorption, typically by an order of magnitude or more. The HITEMP database, however, closely predicted the measured data. For the assumed form γCO2-Ar(T)=γCO2-Ar(T0)(T0/T)n with T0 = 296 K, an optimization routine was implemented to determine the values of γCO2-Ar(T0) and n. From the optimization, values of 0.033 ± 0.004 cm−1 atm.−1and 0.61 ± 0.04 were determined for γCO2-Ar(T0) and n, respectively, which are in good agreement with historical values. These values describe an average CO2–Ar broadening coefficient in the frequency range studied herein and are reliable within the experimental temperature range. In addition, a set of fixed-wavelength measurements at 2190.0175 cm−1were carried out at 122, 446, and 1115 kPa between 1100 and 2100 K, and the HITEMP predictions incorporating the proposed Ar-broadening parameters showed excellent agreement with these data.
author list (cited authors)
Mulvihill, C. R., & Petersen, E. L.