Investigations on Pressure Broadening Coefficients of NO Lines in the 1←0 Band for N2, CO2, Ar, H2, O2 and He

A tunable diode laser absorption spectroscopy (TDLAS)-based spectrometer employing a mid-infrared (Mid-IR) interband cascade laser (ICL) was developed and used to determine pressure broadening coefficients of two NO absorption transitions at 1914.98 cm(-1) and 1915.76 cm(-1) in the fundamental (1 <- 0) band (R11.5 omega 1/2 and omega 3/2) for CO2, N-2, Ar, O-2, He, and H-2. For the first time, a reliable and consistent set of six different pressure-broadening coefficients for the NO line has been measured by a consistent approach covering pressures from 100 to 970 mbar at a temperature of 294 K. Air pressure broadening has been calculated based on N-2 and O-2 coefficients. The stated pressure-broadening coefficients for N-2, CO2, Ar, H-2, O-2, He, and Air have relative errors in the 0.5-1.5% range. For CO2 and H-2,H- broadening results of NO (1 <- 0) band (R11.5 omega 1/2 and omega 3/2) lines are reported for the first time. The results are also compared to previously available literature data. It was found that the broadening coefficients for O-2 and Air are in agreement with literature values, whereas results for Ar and He show larger differences.