# DETERMINATION OF THE DIPOLE MOMENT OF $ArH_{+}$ FROM THE ROTATIONAL ZEEMAN EFFECT BY TUNABLE FAN INFRARED LASER SPECTROSCOPY

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 Title: DETERMINATION OF THE DIPOLE MOMENT OF $ArH_{+}$ FROM THE ROTATIONAL ZEEMAN EFFECT BY TUNABLE FAN INFRARED LASER SPECTROSCOPY Creators: Laughlin, K. B.; Blake, Geoffrey A.; Cohen, R. C.; Hovde, D. C.; Saykally, R. J. Issue Date: 1987 Publisher: Ohio State University Abstract: The first experimental determination of the electric dipole moment of a molecular ion is reported. A tunable far-infrared laser was used to measure the Zeeman effect in low J rotational transitions of $ArH^{+}$ and $ArD^{+}$. Using the theory first derived by Townes $et al.,^{1}$ the dipole was determined from the isotopic dependence of the rotational g-factors. For $ArH^{+}$ and $ArD^{+}$ the current results are: $ArH^{+}, gr = 0.6756(17)$ (10 error), $ArD^{+}$, $g_{r} = 0.3425(14)$, and $ArH^{+}, u = 1.42(40)$ D(corrected for zero point vibrations). The ultimate accuracy of the method is assessed, considering both the required experimental accuracy and the vibrational dependence of the g-factors. Description: $^{1}$ C.H. Townes, G.C. Dousmanis, R.L. White, and R.F. Schwarz, Disc. Farad. Soc. 19, 56 (1955). Author Institution: Department of Chemistry, University of California URI: http://hdl.handle.net/1811/17194 Other Identifiers: 1987-ME-6