Add time:09/25/2019         Source:sciencedirect.com

The microwave spectrum of α-methyl-γ-butyrolactone has been examined in the frequency region 18.0–40.0 GHz. Transitions in the ground and four excited states have been assigned for a ring-twisted-like conformation species in which the methyl group is in the equatorial position. Internal rotation splittings were absent in all observed transitions (up to J = 38), which implies a lower limit for the barrier of ∼3.5 kcal mol−1. The dipole moment components determined from Stark effect measurements are μa = 1.21(2) D, μb = 4.36(5) D, and μc = 0.573(3) D, with μtotal = 4.56(5) D. Despite an intensive effort, no transitions belonging to another species could be identified. A preliminary description of a computer-controlled spectrometer is also given.

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