Two different conformers (axial (in the left picture) and equatorial (right)) are formed in a supersonic jet stream when trimethylene sulfide, a floppy molecule with a large-amplitude ring-puckering motion, is complexed to hydrogen chloride. The axial conformer is the most stable. The relaxation from the equatorial to the axial conformational has been observed using different carrier gases.
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Sanz et al. (2001) studied this question.
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