Abstract
Abstract Microwave spectra have been measured for 10 isotopic species of silyl isocyanate, SiH3NCO, in the ground vibrational state, and in several excited states of the lowest frequency bending vibration, ν10. This vibration is highly anharmonic, with a potential hump of 31.5 cm−1 at the linear configuration, and its effects have been removed from the rotational constants to produce effective ground-state rotational constants B 0 ∗ for each isotopic species. These B 0 ∗ constants have been used to determine the structural parameters, which are now in good agreement with earlier electron diffraction values. Excellent predictions have been made of the centrifugal distortion constants for different isotopic species and vibrational states, as well as of the l-type doubling constants of the various isotopic species.
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