DIPOLE MOMENT OF THE FO RADICAL
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Date
1983
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Ohio State University
Abstract
It has long been a puzzle why the FO radical could not be detected by means of microwave or gas phase electron resonance spectroscopy even after extensive study of the related group VI-VII diatomics (ClO, BrO, SF, SeF, etc.) The recent $observation^{1}$ of a strong vibrational spectrum of FO using laser magnetic resonance (LMR) demonstrated that production of the radical in the gas phase was not especially difficult, and suggested that a small permanent dipole moment might be responsible for the absence of rotational or EPR data. By applying a moderate ($\sim$1 kV/cm) electric field while observing saturated absorption signals in the LMR spectrum at 9.7 $\mu$m, it has now been possible to measure the dipole moment. The values obtained are amazingly small (e.g. 0.0026 D for v=0, J=1.5; 0.024 D for v=1, J=1.5) and they fully explain the previous lack of success in observing spectra in the microwave region. $^{1}$A.R.W. McKellar, Can. J. Phys. 57, 2106-2113 (1979).
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Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada