High-temperature He- and O2-broadening of the R(12) line in the 10 band of carbon monoxide
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2018 Elsevier Ltd Line shapes of the R(12) line in the 10 band of CO were measured near 1 atm between 1100 and 2200 K in mixtures of helium and oxygen behind reflected shock waves. A quantum cascade laser was scanned over the R(12) line at 2190.0175 cm1 with a scan range of 0.4 cm1 and a scan rate of 2 kHz. Voigt profiles were fit to the measured line shapes. The temperature dependence of the broadening coefficient was assumed to take the form (T) = (T0)(T0/ T)n (T0 = 296 K). By extrapolating from the high-temperature data, values of 0.048 0.005 and 0.048 0.004 cm1atm1 were obtained for COHe(T0) and COO2(T0), respectively, while values of 0.53 0.06 and 0.62 0.04 were obtained for nCO He and nCOO2, respectively. For validation purposes, line shapes were also measured in argon mixtures; the resulting CO-Ar broadening parameters were in excellent agreement with recent literature values. Line shapes were also measured at room temperature in mixtures of CO/He and CO/O2; excellent agreement was found between measured and historical values of COHe(T0) and COO2(T0). The general behavior of the broadening coefficient over a wide temperature range is discussed. The broadening parameters presented herein are useful for modeling CO-He and CO-O2 broadening of the R(12), 10 transition between 1100 and 2200 K and are the first measurements of their kind.