Abstract
Absorption coefficients of water vapor were investigated for the frequency of a water vapor laser in the far-infrared (λ = 118.6 μm). The theoretical treatment of these coefficients was carried out assuming self-broadening of H 2O and D 2O rotational transitions as well as foreign gas broadening of these vapors by nitrogen. Comparing these theoretical values with the corresponding experimentally determined data it turns out that there must be an additional absorption mechanism due to HDO molecules, which in low concentration are contained in natural water and in the D 2O available. Taking into account the absorption by HDO, the theoretical and experimental values show a good agreement. In addition, the absorption coefficients of H 2O and D 2O were measured for foreign gas broadening by hydrogen and argon.
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