Abstract
An infrared-infrared double-resonance technique, employing the sidebands produced by electro-optic amplitude modulation of a single-frequency CO 2 laser, is used to observe the second-order Stark effect of the ν 2 as R(2, 0) transition of 15NH 3. The technique enables the Stark shifts in ground and vibrationally excited states to be observed separately and yields the electric dipole moments: μ( v 2 = 1) = 1.253 ± 0.003 D, μ( v = 0) = 1.469 ± 0.004 D. The relative intensity distribution, linewidths, and line shapes of features in the double-resonance Stark spectra are also examined.
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