Spectroscopic Properties of the Diatomic Oxides of the Transition Elements
The gaseous monoxides of the transition metals present interesting problems in a number of related fields. The group contains some of the most stable diatomic molecules known, so that they are often of importance at high temperatures, and it is indeed through mass-spectrometric studies of high temperature equilibria that their energies of dissociation have most commonly been measured. Their stability and open-shell electron configurations lead to the appearance of allowed electronic transitions in the visible region of the spectrum and some of these are observed in the spectra of not too hot stars. The electronic states involved are often of high multiplicity, and analyses of the transitions offer challenges to conventional high resolution spectroscopy, while the states themselves pose theoretical problems in the formulation of their energy levels. The lighter members ScO, TiO, VO are yet sufficiently simple for ab initio calculations of their electronic structures to be made. Important results have recently followed studies in matrix-isolation spectroscopy, and this technique has supplemented information from gas-phase spectroscopy about nuclear magnetic hyperfine structure which proves to be important in the ground states of some of these molecules.
KeywordsElectron Spin Resonance Electron Spin Resonance Spectrum Transition Metal Oxide Hyperfine Structure Internuclear Distance
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