Abstract
CO2 laser-microwave double resonance (LMDR) spectroscopy with intense electric field was applied to 14NH3 and 15NH3. The three-level double resonance effect caused by the combination of a rovibrational transition in the v2 band and an inversion transition in the ground state was observed. The applied electric field was calibrated with an accuracy of 10 ppm using the infrared-infrared double resonance signals of PH3, which in turn were calibrated against the OCS dipole moment. In total, 76 and 37 LMDR signals originating from 24 and 16 inversion transitions in the range of J = 2-11 and K= 2-10 were observed for 14NH3 and 15NH3, respectively.
© 1986 Optical Society of America
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