We present laboratory measurements of the water vapor continuum absorption in the far-IR region from 14 to 200 cm−1. These data were obtained using a Fourier Transform spectrometer IFS125 HR associated with a multipass absorption cell and with the synchrotron far-IR broadband radiation extracted by the AILES beamline of SOLEIL facility. The spectra were recorded at room temperature (296 K) and pressures ranging from 2.73 to 15.1 mbar. A comparison with presently available experimental data is presented and the nature of the possible contributors to the continuum is discussed. The new data considerably extend and unify diverging results of previous measurements of the continuum performed in several spots within the range from about 3 cm−1 up to 84 cm−1. The new evidence of significant contribution of the water dimer to the continuum formation is revealed in the range of 14–35 cm−1. Analysis of the possible cause of the observed continuum indicates that its significant part in the range of the maximum intensity of water monomer rotational spectrum cannot be explained within the current understanding of the continuum origin.
Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer:
As the world’s leading publisher of science and health information, Elsevier serves more than 30 million scientists, students, and health and information professionals worldwide. We are proud to play an essential role in the global science and health communities and to contribute to the advancement of these critical fields. By delivering world-class information and innovative tools to researchers, students, educators and practitioners worldwide, we help them increase their productivity and effectiveness. We continuously make substantial investments that serve the needs of the global science and health communities.
and 5.3 mbar (red) in microwindows of transparency within frequency range of 40–200 cm−1 (points) and result of their approximation by function (1) (solid lines). Dash lines are 1σ confidence intervals. T=296 K
Из-за особенностей Рис.4-а,b некоторые данные Fig.4-a,b полученные сканированием, только качественно отвечают данным, приведенным на рис.4-a,b.
