Abstract
The free jet millimeter wave spectrum of 1,3-dioxepane has been investigated in the 60–78 GHz frequency range. Rotational transitions belonging to the ground vibrational state have been observed and measured, yielding the rotational constants A = 3565.780(2), B = 3193.448(1) and C = 1936.312(2) MHz. The absence of low lying vibrational satellites and the kind of transitions observed (onlyμ a -type) demonstrate that, in contrast with previous reports, the molecule is rather rigid and possesses C 2 symmetry.
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