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Macroscopic quantities of the metallo-carbohedrenes TI(8)C(12) and V(8)C(12) have been synthesized with an arc discharge technique. Mass spectroscopy of raw soot samples generated in both an alternating and direct current arc between two metal-graphite powder composite electrodes establishes that the titanium and vanadium analogs of the metallo-carbohedrenes have been produced. An estimated yield of approximately 1 percent is obtained, and significantly, the products are stable in air.

Abstract. Electron impact ionization of propane (C3H8) was studied using the ion beam deflection technique and a double focussing mass spectrometer in conjunction with a recently developed correction procedure that accounts for discrimination due to the initial kinetic energy of fragment ions. The relative corrected partial ionization cross sections for the production of C3H~-, C3 H+, C3HJ , C3Hff, C3H {, C3H3 ~, C3H +, C3 H+, C~-; C2H if, Call2, C2 H [ , C2H + , C2 H+ , C~' C H + , CH +, CH + , C +. c ~ H2+, " 3 5 C3H42+, C3H~ + and C3H~ + were determined from threshold up to 950 eV. Absolute partial ionization cross sections were obtained by charge weighted summing of all the observed partial ionization cross sections and by normalizing to a recent accurate determination of the total ionization cross section at 100 eV by Djuric et al. 1991. The absolute total ionization cross section curve obtained is in excellent agreement in shape and magnitude with the low energy data ( < 200 eV) of Djuric et al. 199I and the high energy data points of Schram et al. i966.

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