We report frequency measurements for relatively weak H<sub>2</sub>O and <sup>16</sup>O<sub>3</sub> rotational transitions in the ground state and in the ν<sub>2</sub> = 1 vibrationally excited state. We obtained the frequency measurements by using the laboratory technique of tunable far-infrared spectroscopy with the objective of improving H<sub>2</sub>O and O<sub>3</sub> line parameters required for modeling the important atmospheric spectral window near 119 cm<sup>−1</sup>. New sets of molecular constants are calculated from the <sup>16</sup>O<sub>3</sub> data, and improved values are reported for the frequencies of the H<sub>2</sub>O lines. The improvement in atmospheric simulations obtained with the new results is illustrated by comparison with recent high-resolution balloon-based atmospheric measurements. These new data significantly improve simulations of high-resolution atmospheric emission spectra.
© 1997 Optical Society of America
Paolo De Natale, Luca Lorini, Massimo Inguscio, Ira G. Nolt, Jae H. Park, Gianfranco Di Lonardo, Luciano Fusina, Peter A. R. Ade, and Alexander G. Murray, "Accurate frequency measurements for H2O and 16O3 in the 119-cm−1OH atmospheric window," Appl. Opt. 36, 8526-8532 (1997)