Measurements Of N-2, Co2, Ar, O-2 And Air Pressure Broadening Coefficients Of The Hcl P(5) Line In The 1-0 Band Using An Interband Cascade Laser

We determine the CO2, N-2, Ar, O-2 and air pressure broadening coefficients of the (HCl)-Cl-35 P(5) absorption line at 2775.77 cm(-1) in the fundamental (1 <- 0) band using a newly developed direct tunable diode laser absorption spectroscopy (dTDLAS)-based spectrometer employing a mid-IR interband cascade laser (ICL). For the first time, a reliable and consistent set of five different foreign pressure broadening coefficients for the same HCl P(5) line has been measured by a consistent metrological approach covering pressures from 100 to 600 hPa at temperatures of 294 and 295 K. The relative uncertainties of the stated CO2, N-2, Ar, O-2 and Air pressure broadening coefficients are in 1-3% range. The results are compared to previously available literature data-two broadening coefficients have been improved in accuracy and two have been determined for the first time in the sub 1000 hPa pressure range.