Photoacoustic measurements of the water vapor continuum absorption in the 1.6 mm window
V.A. Kapitanov, K.Y. Osipov, I.V. Ptashnik
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: континуальное поглощение, водяной пар, окна прозрачности атмосферы, оптико-акустический спектрометр, continuum absorption, water vapor, atmospheric windows, photoacoustic spectrometer
Abstract
The pure water vapor absorption spectra have been measured by the photoacoustic method in transparency microwindows near 6177 cm-1 at several pressures at a room temperature. Cross section of the water vapor continuum absorption has been determined to be (5.4 ± 0.8) × 10-24 × cm2 × mol.-1 × atm-1. This value is 4 times lower than the data known from FTS measurements and 20 times higher than the results obtained from CRDS measurements in this transparency window.
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