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84 Poster session, D37Absorption spectra of H 2 18 O in the 15150 – 15600 cm -1 spectral regionV.I. Serduykov, L.N. Sinitsa 1 , S.S. Vasilchenko, S.N. Mikhailenko1 Zuev Institute of Atmospheric Optics, Russia, sln@asd.iao.ruAbsorption spectra of H 2 18 O have been investigated between 15150 and 15600 cm -1 .The spectra were recorded with a Bruker IFS-125M Fourier transform spectrometer atroom temperature and spectral resolution of 0.05 cm -1 . The sample prepared by"Isotope" has been enriched to 70% Н 2 18 О. Vertical multipass absorption cell of Whitetype with a base of 60 cm allowed to get an optical path length as long as 19.2 m. Cellmirrors had reflection of O.96. Recording was done with pressure of 29 mbar andtemperature of 297K. Signal to noise ratio was 5000.The achieved sensitivity, on the order of K min ~ 10 -7 cm -1 , has allowed one to measureabout 1000 lines of the H 2 18 O molecule with intensities down to 1×10 -26 cm/molecule at296 K. Observed lines were assigned to the transitions of vibration-rotation bands:(311) - (000), (231) - (000), (033) - (000), (212) - (000), (330) - (000), and (052) -(000). Comparison of obtained parameters (line positions and line intensities) with theresults of theoretical studies is discussed [1, 2].Serdyukov V.I.Sinitsa L.N.Vasilchenko S.S.Mikhalenko S.N.The work is partly supported by grants of RFBR , Program of RAS 3.9.6, Grant ofMinistry of Education and Science of the Russian Federation №11.519.11.5009.References[1] H. Partridge, D.W. Schwenke J. Chem. Phys. 106, 4618, 1997[2] D.W. Schwenke, H. Partridge J. Chem. Phys. 113, 6592, 2000