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Fig. 1

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Geometry and electric dipole moment of the most stable conformer of glycinamide, and their orientation in the principal rotational axis frame. The dipole moment vector is confined to the ab inertial plane, and is drawn from the notional negative to the notional positive charge. The molecule has a planar amido NaH2 group, and a pyramidal amino NtH2 group. The geometry is non-planar with a small ~100 cm−1 barrier at the Cs-symmetry configuration, where all heavy atoms are in the same plane, which also bisects the CH2 and NtH2 groups. Tunnelling across the barrier between the two equivalent non-planar configurations leads to appreciable splitting into pairs ofall vibrational states, including the ground state.

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