Absorption of millimeter to submillimeter waves by atmospheric water molecules |
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Authors: | Masataka Mizushima |
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Affiliation: | (1) Department of Physics, University of Colorado, 80309 Boulder, Colorado |
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Abstract: | Using the values of the rotational molecular parameters (including cencrifugal distortion terms) of the H216O molecule, which can explain 12 observed transitions below 800 GHz, all rotational energy levels with normalized Boltzmann factors larger than 5×10–8 at 300°K are calculated. Probabilities of all possible electric dipole transitions among these states, 2277 lines, are calculated using the eigenfunctions thus obtained, and the permanent electric dipole moment of 1.8546 Debye. Assuming the single and full Lorentzian line forms, we calculated the absorption coefficient for millimeter to submillimeter region. Our result, using the single term Lorentzian line form, agrees quite well with experiment for 1 Torr of water vapor in 760 Torr air at 300°K. |
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Keywords: | water vapor millimeter waves submillimeter waves excess absorption Lorentzian line form window regions |
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