Abstract
We recorded the ν7 fundamental band of dimethyl-ether around 400cm−1 for the normal and 13C-enriched isotopologues using the Fourier transform spectrometer at the SOLEIL Synchrotron facility. For all three species P, Q and R branch-transitions up to J=20 and Ka=5 were assigned and the band origins and rotational parameters of Watson’s A-reduced Hamiltonian have been determined by the least-squares fitting procedure. The line splitting due to the torsional tunneling is observed for low J transitions, which is attributed to the ro-vibrational interaction with the excited torsional states.
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