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Published March 9, 1987 | Published
Journal Article Open

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

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.

Additional Information

© 1987 The American Physical Society Received 17 November 1986 This work was supported by the National Science Foundation under Grant No. CHE-84-02861. One of us (K.B.L.) would like to thank the National Science Foundation for a fellowship. Another of us (G.A.B.) is a Berkeley Miller Research Fellow, 1985-1987. Another of us (R.J.S.) was a Berkeley Miller Research Professor, 1985-1986.

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