The rotational Zeeman effect in the ArOCS van der Waals complex

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Abstract
The rotational Zeeman effect has been measured in the weakly bound complex ArOCS. The study was carried out on a pulsed Fourier‐transform microwave spectrometer employing a supersonic nozzle and a Fabry–Perot cavity. The following spectroscopic constants were obtained: Projection equations are used to relate the magnetic properties of free OCS to those of the complex. An analysis of the force field as obtained from centrifugal distortion is used to determine an average structure for ArOCS and mean square amplitudes of the van der Waals motions. These are used to augment the projection analysis. The molecular quadrupole moment of ArOCS is calculated from the Zeeman parameters. With an estimated bulk magnetic susceptibility, diamagnetic susceptibilities and the second moments of electronic charge distribution are also calculated.