| The Stark spectra of ZrS, TiS, MgNC, and YCC have been recorded and their permanent electric dipole moments, mu, have been determined using high-resolution laser induced fluorescence molecular beam techniques. Additionally, the measurements are considered from historical and theoretical perspectives. The experimental findings are reported, reviewed and comparatively discussed.;The permanent electric dipole moments for these molecules were determined to be the following quantities: The value of mu for the C1Sigma + state of ZrS was 4.71(6) D and X1Sigma+ state was 3.86(6) D. The value of mu for TiS was 5.75(10) D for the X3Delta1 state and 4.41(9) D for the C 3Delta1 state. The value of mu for MgNC was determined to be 5.308(75) D for the X˜2Sigma 1 and 6.13 8(46) for the A2pi 1 state. The value of mu for YCC was determined to be 6.83(3) D for the (000) X˜2A1 state and 7.09(6) for the (000) A2A 1 state.;The chemical trends of the transition metal sulfides have been comparatively discussed in relation to each other and the transition metal oxides. The value of mu for MgNC has also been comparatively discussed with that for CaNC. Similarly, the difference in mu for YCC is discussed with the isovalent molecules, YS and YO. The findings suggest that the differences in the dipole moments in these molecules are due to a variety of factors but the polarization of the orbitals is generally the dominating effect. Molecular orbital correlation diagrams and qualitative ideas of bonding trends have been developed from these findings. |
