Abstract
Rotational spectra of methylsilane in the ground and several torsionally excited states were measured in the region from 87 to 350 GHz with Doppler-limited resolution. For some of the transitions in the ground vibrational state, the internal rotation splitting has been recorded with sub-Doppler resolution via the saturation technique. Transitions in the torsional states with v t ≤ 2 have been assigned and analyzed with a least-squares procedure, employing a direct diagonalization method for calculating the torsion-rotation energy levels. A phenomenological Hamiltonian has been developed to describe on the free-internal rotor basis the internal and overall rotation of symmetric-top molecules. The potential barrier of methylsilane to internal rotation was determined to be V 3 ≈ 590.5 cm −1.
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