Quadrupole Hyperfine Structure in the Rotational Spectra of Sulfuryl Chloride

The nuclear quadrupole coupling of [ Cl, Cl]- and [ Cl, Cl]-sulfuryl chloride, SO Cl was investigated using waveguide microwave Fourier transform (MWFT) spectroscopy. The analysis was performed with direct diagonalization of the Hamiltonian matrix. It was possible to determine the complete coupling tensor with high accuracy. SO Cl : χaa ( Cl1) = χ Cl2) = -33.049(6) MHz, χ ( Cl1) = χ ( Cl2) = 40.356 (9) MHz, χ ( Cl1) = - χ Cl2) = + 52.67 (63) MHz. SO C137C1: xaa ( Cl)= -29.582(17) MHz, χ Cl) = 40.340(25) MHz, χ Cl)= +52.3(14) MHz, χ Cl)= -28.723(18) MHz, χ Cl) = 31.822(28) MHz, χ ,( Cl) = + 37.3(19) MHz. We also determined the quadrupole coupling constants in their principal axes system. In comparison with the structure, the z-axis of the coupling tensor was found to be tilted 2.0° out off the S-Cl bond axis