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The two triad systems of hydrogen sulfide (2ν2, ν1, and ν3near 4 μm and 3ν2, ν1+ ν2, and ν2+ ν3near 2.7 μm) were analyzed using 14 spectra recorded at 0.0056 and 0.011 cm−1resolution with the McMath Fourier transform spectrometer located at Kitt Peak National Observatory. Experimental upper state levels of H232S, H234S, and H233S were obtained from assigned positions (as high asJ= 20 andKa= 15...