The Asymmetric Rotor. XI. Hydrogen Sulfide Absorption in the Regions 8700 cm−1 and 11 000 cm−1

By the use of a 21‐foot grating spectrograph and absorbing paths of up to 350 feet, sixty lines in the region from 10 870 cm⁻¹ to 11 100 cm⁻¹ have been measured and analyzed as the rotational structure of an A‐type band. It may be identified as the lower component of the resonating pair (n_σ, n_π, n_δ)=(131), (311). Most of the more than eighty hydrogen sulfide absorption lines measured between 8560 and 8830 cm⁻¹ have been assigned to an A‐type band identified as the lower component of the (121), (301) resonating pair. Several additional lines definitely not due to water appear to indicate the existence of a superimposed B‐type band having about the same upper state parameters, presumably the lower component of the pair (211), (031). In cm⁻¹, $$\begin{array}{c}{\nu }_0{\text{=8697.3\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}A}}^{*}{\text{=10.29\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}B}}^{*}{\text{=8.75\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}C}}^{*}\text{=4.48}\\ {\nu }_0{\text{=11008.78\hspace{0.17em}\hspace{0.17em}A}}^{*}{\text{=10.197\hspace{0.17em}\hspace{0.17em}B}}^{*}{\text{=8.559\hspace{0.17em}\hspace{0.17em}C}}^{*}\text{=4.411.}\end{array}$$