Abstract
The rotational spectrum of methacrylonitrile has been investigated in the vibrational ground state between 8 and 200 GHz. High- J transitions have been measured and fitted to a semirigid rotor Hamiltonian including some sextic constants. The internal rotation splittings have been analyzed using the internal axis method. The derived barrier to internal rotation of the methyl group is V 3 = 1986 cal/mole. The components of the molecular dipole moment were calculated from Stark-effect measurements as μ a = 3.940(2) D, μ b = 0.26(5) D, and μ t = 3.948(4) D. The first two excited states of the lowest-frequency in-plane CCN bending vibrational mode, the first excited state of the out-of-plane CCN bending mode, and the first excited state of the methyl torsion have also been assigned.
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