Abstract
The weak rotational spectrum of styrene has been measured by pulsed microwave Fourier transform (MWFT) spectroscopy. The assignments of the spectrum have been confirmed with radiofrequency-microwave double-resonance experiments associated with the MWFT technique. Rotational constants and quartic centrifugal distortion constants have been fitted from the measured transition frequencies. The accidentally small electric dipole moment of μ a = 0.122(1) D and μ b < 0.02 D has been determined by a MWFT Stark experiment. Torsional satellites due to the vinyl group internal rotation have been measured up to the seventh excited state. The rotational constants of these states have been used to determine the potential energy and the associated structural relaxation.
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