Abstract
An intense CO 2 laser is shined into a Stark cell containing NH 3 and shifts the energy levels of the molecule. The transition between two nondegenerate sublevels is observed by intermodulated optoacoustic detection with a second tunable CO 2 laser. The light-induced shifts in the transition frequency are measured as a function of laser power and detuning. A simplified theoretical model is developed in a form suitable for direct comparison with experimental data and a satisfactory agreement is obtained.
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