Measurement of the electric dipole moment of NO (X-2 Pi upsilon=0,1) by mid-infrared laser magnetic resonance spectroscopy

A pair of parallel Stark plates are added to a CO laser magnetic resonance spectrometer to apply electric field in the absorption cell. This apparatus is used to measure the molecular electric dipole moment via Zeeman and Sta rk effects simultaneously. The saturated absorption spectra of NO (X(2)Pi ( 3/2), V = 1 <-- 0) was observed and the electric dipole moments of NO were directly measured in the presence of an electric field. The dipole moments are determined as <mu>(o)(v = 0) = 0.1595(15) D, mu (1) (v = 1) = 0.1425(16 ) D. The electric dipole moment of the vibrationally excited state (v = 1) is determined for the first time. The dependence of the electric dipole mom ents on its nuclear distances is interpreted.