Abstract
The quartic centrifugal distortion constants of methyl oxirane (propylene oxide) have been determined by analysis of the frequencies of rotational transitions with J ≤ 25. Bond lengths and angles for the heavy atoms have been determined from rotational constants obtained by analysis of the spectra of the three singly substituted 13C species. The r s value obtained for the CC bond length in the ring is 1.451 ± 0.020 Å, and for the length of the CC (methyl) bond is 1.518 ± 0.010 Å; the ∠CCC is 121.7° ± 1.3. Effective parameters show the ring to be nearly an equilateral triangle with the CO bond length equal to 1.45 ± 0.020 Å.
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