STARK AND ZEEMAN EFFECT OF ETHYLENE OBSERVED BY SUB-DOPPLER INFRARED SPECTTROSCOPY
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Date
1986
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Ohio State University
Abstract
Recent development of sub-Doppler spectroscopy using microwave modulation sidebands of $CO_{2}$ laser radiation has enabled us to perform ultrahigh resolution tunable infrared $spectroscopy^{1}$. Using this technique we studied the small Stark and Zeeman effect of ethylene. Clear Stark splittings have been observed for several low J vibration-ratation lines of the $\nu_{7}$ band using an electric field of up to 50 KV/cm. The analysis of the Stark pattern has given the following polarizability anisotropy for the ground state: $\alpha_{zz}-\frac{\alpha_{xx}+\alpha_{yy}}{2} = 1.42(12)\AA^{3}$ $\alpha_{zz}-\alpha_{yy} = 0.27(66)\AA^{3}$ The polarizability tensor components for the $\nu_{7}$ state are considerably different from the ground state, probably because of the near degeneracy of the $\nu_{7}$ state with other vibrational states $(\nu_{4}, \nu_{8}, \nu_{10})$. More extensive analysis, as well as a study of Zeeman effect to determine the rotational g-factors, are in progress.
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$^{1}$ Y. T. Chen, J. M. Frye and T. Oka, J. Opt. Soc. Am. B, (1986) in press Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago, Chicago, Illinois 60637
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