Add time:07/27/2019         Source:sciencedirect.com

Inelastic neutron scattering from the 4-methylpyridine crystal (C6H7N) and its perdeuterated analogue (C6D7N) were recorded at 5 K in the 0–9.5 cm−1 range. The main intensities appear at 4.16 and 0.8 cm−1 for the hydrogenated and deuterated compounds, respectively. They are ascribed to the methyl torsional mode and the isotopic ratio (4.16/0.8 ≈5) indicates a tunnel splitting consistent with a periodic potential. In addition, there is a weak band at 3.82 cm−1 for C6H7N which is ascribed to the τ (CH3) mode, although the analogous band could not be identified in the deuterated derivative. The methyl torsion dynamics is thus likely to be more complicated than suggested by a simple periodic potential.

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