Collisional-Broadened and Dicke-Narrowed Lineshapes of H216O and H218O Transitions at 1.39 μm

An accurate comparison of lineshape models on H2O lines in the spectral region around 3μm

“…Dicke narrowing was also observed by Giesen et al [27] for several of H 2 O m 2 band lines (for high J number) perturbed by Ar, N 2 , O 2 , and air. The influence of Dicke narrowing on H 2 O lines in the 1.39 lm region perturbed by N 2 and O 2 was clearly demonstrated by Moretti et al [28]. The review of recent works on water can be found in Gamache and Hartmann paper [29].…”

First Odin sub-mm retrievals in the tropical upper troposphere: humidity and cloud ice signals

“…Line intensities in the microwave region are generally assumed to be known with 2% accuracy, and this value is adopted here. The air broadened width is derived from measurements of the corresponding line in a vibrational band at 1.39 µm (Moretti et al, 2001) and a direct error estimate is difficult. The value is 3.20 MHz/hPa.…”

Self-, Nitrogen-, and Oxygen-Broadening Coefficient Measurements in the ν1 Band of H2O Using a Difference Frequency Generation Spectrometer at 3 μm

“…In a more recent work Colmont et al (17) measured two rotational transitions of water vapor perturbed by N 2 , O 2 , and air. In our very recent paper (18) we investigated seven lines of the combination band ν 1 + ν 3 and of the overtone band 2ν 1 by using a distributed-feedback (DFB) diode laser at 1.39 µm. In that paper broadening induced by nitrogen, oxygen, and water vapor itself was analyzed using a standard Voigt profile and a Nelkin-Ghatak profile.…”