High accuracy spectroscopic parameters of the 1.27 µm band of O2 measured with comb-referenced, cavity ring-down spectroscopy

Parameterized model to approximate theoretical collision-induced absorption band shapes for O2-O2 and O2-N2

“…Here we compare the theoretical spectra published in [10,11] to four sets of measured CIA in the 1.27 μm O 2 band corresponding respectively to Maté et al [14], Mondelain et al [13], Kassi et al [12], and Fleurbaey et al [24]. The experiments of Maté et al were done using Fourier transform spectroscopy (FTS) [14], and the other three cited studies were based on CRDS [12,13,24].…”

Revising the H2 16O line-shape parameters around 1.1 μm based on the speed-dependent Nelkin–Ghatak profile and the Hartmann–Tran profile

“…This result is consistent with the view of Wójtewicz et al [28] that it is difficult to decorrelate the speed dependence of collision broadening and Dicke narrowing. was mentioned in the literature: [16,29] "Whether the experimental conditions consider an important factor of parameter η, that is, HTP parameters need to be obtained under the high signal-to-noise ratio spectrum and high precision frequency standard". In view of the relatively low signal-to-noise ratio (QF < 1000) in our experiment, the spectral line parameters obtained with the SDNGP are more reasonable than those obtained with the HTP.…”

Simultaneous collision-induced transitions in H2O+CO2 gas mixtures

“…Another advantage of recordings at sub-atm pressures is that the contribution of local absorption transitions is easier to calculate and remove, since line-mixing effects may be disregarded and isolated line shapes can be used. For instance, CRDS was recently applied to the characterization of the O2 CIA band at 1.27 µm both at NIST [29] and in our laboratory [30,31]. The use of low O2 pressures enabled to minimize the impact of line mixing effects on the CIA determination obtained with an agreement of less than 1% between the two datasets at room temperature.…”