Fourier-transform absorption spectrum of the H217O molecule in the 9711-11335 cm-1 spectral region: the first decade of resonating states.

Physics

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Laboratory Spectra: Water Vapor

Scientific paper

Fourier transform spectra of 18O-enriched, 17O-enriched, and natural water vapor recorded between 9600 and 11400 cm-1 have been analyzed to assign the H217O spectral lines. More than 1000 transitions were finally assigned to the H217O isotopic species leading to 420 precise experimental energy levels of the (003), (201), (121), (102): (300), (220) vibrational states. Rotational, centrifugal distortion, and resonance coupling parameters have been derived from the fit of the experimental energy levels to an effective Hamiltonian based on Pade-Borel approximants well suited to describe the large centrifugal distortion in H2O. The resulting rms deviation is 0.013 cm-1 with 97 varied parameters.

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