Electric dipole moment and quadrupole hyperfine structure of OC–HCl and OC–DCl

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Abstract
Microwave and radio frequency spectra of the weakly bound complex OC–HCl and two of its isotopes measured in static electric field are reported. The values of the dipole moments and the hyperfine constants determined are This molecular complex is shown to have a significant induced dipole moment which is much larger than elementary electrostatic calculations predict. The ratio of the electric quadrupole coupling constant in the DCl complex to that of free DCl is shown to be the same using either the chlorine or the deuterium, indicating no measurable distortion in the electric field gradient at the deuterium nucleus.