ELECTRON IMPACT IONIZATION STUDIES OF SEVERAL METALLOCENES
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Date
1972
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Ohio State University
Abstract
Negative and positive ions of ferrocene, nickelocene and magnesocene produced by collisions with monoenergenetic electrons have been studied. Positive ion appearance potentials have been determined for the products $(C_{10}H_{10}M)^{+}$, $(C_{5}H_{5}M)^{+}$ and $M^{+}$, and the derived ionization potentials are compared with recent photoelectron data. In all cases cyclo-pentadienyl anions were produced at low electron energies; however, their cross sections of formation differ by orders of magnitude. The most striking feature of the negative ion studies was the observation of a long-lived (lifetime $> 100 \mu$sec) parent negative ion in nickelocene at thermal electron energies, and a second broader resonance centered at approximately one electron volt. The auto-detachment lifetime for the second resonance decreases from $60\ \mu$ sec at 0.5 eV to 20 $\ \mu$ sec at 1.5 eV.
Description
Research sponsored by the U.S. Atomic Energy Commission under contract with the Union Carbide Corporation.
Author Institution: Chemistry and Health Physics, Divisions Oak Ridge National Laboratory
Author Institution: Chemistry and Health Physics, Divisions Oak Ridge National Laboratory