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Atmospheric and Oceanic Optics

2018 year, number 4

Study of the water vapor absorption spectrum in the visible region from 19480 to 20500 cm-1

L.N. Sinitsa, V.I. Serdyukov, E.R. Polovtseva, A.D. Bykov, A.P. Shcherbakov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: Фурье-спектроскопия, поглощение водяного пара, видимый диапазон, параметры спектральных линий, уровни энергии, Fourier transform spectroscopy, absorption of water vapor, visible spectral range, parameters of spectral lines, energy levels

Abstract

The vibrational-rotational absorption spectrum of water vapor was recorded and analyzed in the visible region from 19480 to 20500 cm-1. The measurements were carried out at the IFS-125M Fourier spectrometer with a resolution of 0.05 cm-1 at a pressure of 26.3 mbar, a temperature of (24±1) oC at an optical path 24 m long. We used a multipass White cell with a base length of 60 cm. The light-emitting diode was used as the radiation source. The signal-to-noise ratio was about 20000. As a result of the spectrum analysis, a list of more than 420 lines has been formed, which includes line centers and intensity and quantum vibrational-rotational identification. More than 220 vibrational-rotational energy levels of 21 upper vibrational states have been determined.