Determination of the dipole moment of ArH+ from the rotational Zeeman effect by tunable far infrared laser spectroscopy

K. B. Laughlin, Geoffrey A. Blake, R. C. Cohen, D. C. Hovde, and R. J. Saykally
Phys. Rev. Lett. 58, 996 – Published 9 March 1987
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Abstract

The first 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+, and the dipole was determined from the isotopic dependence of gr. The result (μ=1.4±0.4 D) is in marginal agreement with ab initio calculations (2.2 D). It is shown that this method can ultimately provide molecular-ion dipole moments accurate to within a few percent. The adiabatic internuclear separations of both isotopes were also determined from the gr values.

  • Received 17 November 1986

DOI:https://doi.org/10.1103/PhysRevLett.58.996

©1987 American Physical Society

Authors & Affiliations

K. B. Laughlin, Geoffrey A. Blake, R. C. Cohen, D. C. Hovde, and R. J. Saykally

  • Department of Chemistry, University of California, Berkeley, California 94720

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Vol. 58, Iss. 10 — 9 March 1987

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