MOLECULAR VIBRO-ROTATIONAL THREE LEVEL STARK SPECTROSCOPY IN OPTICALLY PUMPED FIR LASERS
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Date
1980
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Ohio State University
Abstract
The application of an electric field to the gas active in optically pumped FIR lasers has been successful in displaying the Stark effect on high J rotational levels of symmetric tops [1] and of slightly asymmetric rotors with internal rotation [2]. Saturation effects cause a hole burning at the center of the Doppler profile of the pumping transition and a sharp drop in the FIR emission [3]. this dip, transferred form the IR to FIR transition, is useful tool, for a precise measurement of the offsets between the molecular absorption transitions and the pumping $CO_{2}$ laser line center and for an investigation of the Stark effect on the vibrational infrared transitions. A unique feature of this spectroscopic technique is that system acts as a three coupled levels in the folded configuration. As a consequence it is possible to investigate the coupled vibro-rotational transitions with a double check of the assignments which is not possible in the conventional infrared Stark spectroscopy. Results are reported for many transitions of $CH_{3}OH$. A careful investigation is performed around the 9-P(34) $CO_{2}$ laser line. Three $CH_{3}OH$ infrared absorptions are resolved and assigned, together with the coupled FIR emissions.
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$^{1}$ M. Inguscio et al., Optics Lett. 4, 9 (1979) $^{2}$ M. Inguscio et al., Appl. Phys. 18, 261 (1979) $^{3}$ M. Inguscio et al., Optics Commun. 30, 355 (1979)
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