The infra-red spectrum of hydrogen persulfide has been investigated in the region 1.5 to 15μ, and vibrational assignments have been made. The perpendicular band at 2μ has been studied under high resolution and a value for one of the rotational constants has been obtained. The data strongly support a chain structure for hydrogen persulfide and probably exclude cis- or trans-planar structures, but give no very definite information regarding the azimuthal angle.
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Wilson et al. (1949) studied this question.
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