FTIR spectrometer with 30 m optical cell and its applications to the sensitive measurements of selective and nonselective absorption spectra.

A description of the spectroscopic complex at V.E. Zuev Institute of Atmospheric Optics, SB RAS, operating in a wide spectral range with high threshold sensitivity to the absorption coefficient is presented. Measurements of weak lines and nonselective spectra of CO 2 and H 2 O were performed based on the built setup. As new application of this setup, positions and intensities of 152 weak lines of H 2 O were measured between 2400 and 2560 cm −1 with threshold sensitivity of 8.6×10 −10 cm −1 , and compared with available calculated and experimental data. Essential deviations between the new intensity measurements and calculated data accepted in HITRAN 2012 and GEISA 2015 forthcoming release are found. [ABSTRACT FROM AUTHOR]