| Dispersed fluorescence studies on the diatomic molecules MoC, RuC, and PdC are reported. New states identified in MoC and RuC are the [...]2delta112sigma1, 3,1Delta 2 states and the [...]2delta312sigma 1, 1Delta2 state, respectively. Five states are observed by dispersed fluorescence in PdC. The ground state is found to be [...]2delta412sigma2, 1Sigma +, with the [...]2delta412sigma16pi 1, 3piO manifold of states lying about 2500 cm-1 above the ground state. The [17.9]O=1 state of PdC is also identified as [...]2delta412sigma 113sigma1, 3Sigma+(O=1), corroborating recent results of resonant two photon ionization spectroscopy studies. The spin-orbit interactions of these molecules are analyzed to deduce the composition of the molecular orbitals, and comparisons are made to ab initio theory when possible. An examination of the trends in bond energy, bond length, and vibrational frequency among the 4d transition metal carbides is also provided.;Dispersed fluorescence studies on the 3d transition metal carbides TiC, FeC, and NiC are also reported. In this work, low-lying excited electronic states have been found for each molecule. These are suggested to be the 7sigma23pi48sigma11delta 1, 3Delta state of TiC, the 7sigma23pi 48sigma21delta29sigma2 , 3Sigma- state of FeC, and an O=0+ state of NiC. For FeC and NiC these assignments are supported by the rotational contours of the observed fluorescence bands. These results are compared to the available ab initio calculations, and discussed in light of the severe configuration interaction problems associated with the 3d carbides.;Finally, dispersed fluorescence spectroscopy of the organometallic radicals NiCH3, CrCH3, and CrCCH has been done. The results are compared to available experimental data and theoretical calculations. These studies are a first step toward understanding the electronic structure of more complex organometallic systems. |
