Abstract
The free jet absorption millimeter-wave spectrum of methylthioglycolate-SD has been investigated in the 60–78 GHz frequency range. The double-minimum potential associated with the SD group torsion generates a vibrational spacing Δ01= 8285(5) MHz between theO+andO−states of theAsublevel. This splitting, compared to the corresponding value of 18 953 MHz for the normal species, suggests a large involvement of the sulfur atom in the motion. A model is given to describe this motion.
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