Investigations on Pressure Broadening Coefficients of NO Lines in the 1←0 Band for N<sub>2</sub>, CO<sub>2</sub>, Ar, H<sub>2</sub>, O<sub>2</sub> and He
oleh: Sumit Agarwal, Leopold Seifert, Denghao Zhu, Bo Shu, Ravi Fernandes, Zhechao Qu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-01-01 |
Deskripsi
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<sup>−1</sup> and 1915.76 cm<sup>−1</sup> in the fundamental (1←0) band (R11.5 Ω1/2 and Ω3/2) for CO<sub>2</sub>, N<sub>2</sub>, Ar, O<sub>2</sub>, He, and H<sub>2</sub>. 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<sub>2</sub> and O<sub>2</sub> coefficients. The stated pressure-broadening coefficients for N<sub>2</sub>, CO<sub>2</sub>, Ar, H<sub>2</sub>, O<sub>2</sub>, He, and Air have relative errors in the 0.5–1.5% range. For CO<sub>2</sub> and H<sub>2,</sub> broadening results of NO (1←0) band (R11.5 Ω1/2 and Ω3/2) 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<sub>2</sub> and Air are in agreement with literature values, whereas results for Ar and He show larger differences.