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The absorption spectra of H2S from 2000 to 11 147 cm−1 have been obtained with spectral resolutions of 0.006, 0.012, and 0.021 cm−1 using the Fourier transform spectrometer at Kitt Peak National Observatory. The transitions of 21 bands have been assigned for the first time and 9 others reanalyzed so that accurate energy levels, band origins, and rotational parameters could be determined. The analysis of these data revealed some remarkable features in the energy spectrum, e.g., fourfold clustering of rotational levels belonging to the symmetric and asymmetric components of local mode manifolds at a high degree of stretching excitation. This paper reports fitted vibrational parameters and predicted band origins of H232S up to 12 735 cm−1. It also presents the degenerate rotational constants and upper state energies of (301)–(202) and (311)–(212) at 1 μm as illustrations of clustering in the local mode limit.

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