Measurements of N2, CO2, Ar, O2 and Air Pressure Broadening Coefficients of the HCl P(5) Line in the 1–0 Band Using an Interband Cascade Laser

Abstract

We determine the CO2, N2, Ar, O2 and air pressure broadening coefficients of the H35Cl 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, N2, Ar, O2 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.

H2, He, and CO2 Pressure-induced Parameters for the HITRAN Database. II. Line Lists of CO2, N2O, CO, SO2, OH, OCS, H2CO, HCN, PH3, H2S, and GeH4

“…With that being said, there is still a large room for HITRAN updates even with the data that are available. In the near future, we plan to investigate additional data for the target-perturber systems that are already in the database (for instance, from Li et al 2017Li et al , 2018Domanskaya et al 2017;Lyulin et al 2018;Qu et al 2021;Flatin et al 1994).…”

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

“…We have used the well-known TDLAS approach to precisely quantify the pressurebroadening coefficient of the NO transition line in the mid infrared (Mid-IR) band. For the TDLAS, the transmitted intensity through a gaseous sample can be estimated using the renowned Beer-Lambert's law [23,24]:…”

“…Figure 1 depicts the experimental setup for determining the NO pressure broadening coefficients, which is similar to the setup used in other studies [23,26]. To measure the transition lines in the NO 1←0 fundamental band, a 5.2 µ m interband cascade laser (ICL) (Nanoplus GmbH) was used.…”

Collisional broadening of absorption line of carbon dioxide using nitrogen as a buffer gas at a specific wavelength

“…Collisional Linewidth FWHM, for a gas sample containing several kinds of gases, is given by Eq. ( 5) [3]: 5 γ self : coe cient of self broadening.…”

“…Figure(3) shows transmitted (A) and re ected/ reference (B) signals, with the Direct Laser Absorption Spectroscopy (DLAS) using single wavelength scans (to retrieve direct transmission spectra by applying PZT voltage at 120 V and 11 Hz).…”