Diode laser spectroscopy of two acetylene isotopologues (12C2H2, 13C12CH2) in the 1.533μm region for the PHOBOS-Grunt space mission

Near infrared diode laser absorption spectroscopy of acetylene between 6523 and 6587cm−1

“…is the percentage ratio ((This work À HITRAN12)/HITRAN12 Â 100%). and Table 1, the discrepancy of line intensity between our measurements and data from the latest HITRAN12 database is less than 1% (the average absolute value is 0.46%), and an excellent agreement is also found for the lines P11e and P13e reported by Li et al [15], showing that the measurement accuracy is likely better than 1% when these strong bands are used for acetylene concentration detection. For more accurate parameters determination, the speed dependent effect and the effect of line mixing might be considered, as demonstrated by Hashemi et al [18].…”

“…4 transitions. Note that the W-shaped residuals that occurred near the absorption line center can be effectively removed by using advanced line shape models [15], such as Rautian profile and Galatry profile, which take into account the Dicke narrowing effect, lead to a better fit than the one obtained from the Voigt profile.…”

“…For retrieving the absorption line parameters we adopted the standard Voigt model to fit the experimental spectra by using a nonlinear least-squares fitting procedure [15], which uses the Levenberg-Marquardt algorithm to minimize the deviation between the observed and calculated spectra. The Voigt line shape function can be written as the real part of the complex probability function:…”

Frequency comb-referenced measurements of self- and nitrogen-broadening in the ν1+ν3 band of acetylene

“…At very high pressures we limited our analysis to approximately ±0.17 cm À1 from line center because of weak interference from absorption due to these lines. Recently Li et al [18] independently measured acetylene line strengths and found values similar to the HITRAN reported values. Also some years ago, Varanasi and Bangaru [19] also reported intensity measurements for the P(11) transition in this band at 295 K. Their reported value at 295 K was 0.3284 cm À2 /atm, and the value we used for this work was 0.2888 cm À2 /atmosphere.…”

Frequency-comb-assisted absolute calibration and linestrength of H12C13CH ro-vibrational transitions in the 2ν3 band

“…Ab-solute line intensity measurements in the 1.533 μm region were performed by El Hachtouki et al for the ν 1 + ν 3 band with a Fourier transform infrared spectrometer [6] . Accurate linestrengths for some P-branch lines of the same band were later provided by tunable diode laser spectroscopy by Li [7] and by Durry [8] . These papers were intended to produce information useful for the Martian space mission PHOBOS-Grunt, failed in 2012.…”