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We h~ve measured the ionization potentials of gaseous ferrocene and the symmetrically ~ub~tlt~ted chlor~fe?"ocenes, F~( CsHs _ NCI N h (O..;;N";;5) by electron impact techniques. The lOntzatlOn potentIal IS found to mcrease in direct proportion to the number of chlorine substit~tions. !hese results indicate that chlorine ring substitutions result in greater overlap of the 11"-nng orbItals and the metal d orbitals. The binding energies of the unoccupied orbitals of ferrocene and 1,I'-dichloroferrocene have been inferred from photoabsorption studies. The effect of symmetric dichlorination on the splitting of the unoccupied 5e l ferrocene molecular orbital is described. g

Science Foundation (Chemical Dynamics). We are grateful to Erzsebet Lugosi for the vectorized equation solver and to John Tyson for collaboration in Tucson, January 1987, when the first Oregonator rotors finally worked, and for subsequent improvement of initial conditions and discussions of the Oregonator model throughout the preparation of this paper.