Abstract
The spectrum of H218O in the range 15000–15700 cm−1 has been recorded for the first time on a Fourier-transform spectrometer using a high-brightness light-emitting diode as a radiation source. The measurements have been conducted at room temperature with a resolution of 0.05 cm−1. A threshold sensitivity in absorption of 2 × 10−7 cm−1 has been achieved due to both the use of a light-emitting diode and optimization of the multipass cell with a base length of 60 cm, which ensured a 19.2-m length of the absorbing layer. A high signal-to-noise ratio (S/N = 2000–10000) made it possible to record about 670 water-vapor lines with intensities of 1.0 × 10−26–2.2 × 10–24 cm/mol at 296 K. The energies of 265 vibrational-rotational levels of the H218O molecule are determined and attributed to seven vibrational states, namely, (033), (113), (212), (231), (311), (330), and (410).
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