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• W2091663174 abstract "The ions Ar2+, Ne2+, and He2+ are formed in a mass spectrometer operated at high pressures (up to 300 μ) by the bimolecular excited atom reaction R*+R=R2++e, and Ar2+ and Ne2+ are formed by the termolecular ion‐molecule reaction R++2R=R2++R. In helium, while He2+ is formed by a third‐order process, there is doubt that an ionic reaction is involved.Ratios of the rates (cross‐sections) for excitation leading to R2+ formation and ionization are found to be 5.5×10—2, 1.0×10—2, and 6.4×10—2 for argon, neon, and helium. The measurements were made at nominal electron voltages (EV) of 15, 20, and 22 v, respectively, which correspond to maximum excitation. Values of 1.4×10—2 and 0.45×10—2 were also obtained at EV=70 v for argon and neon.The experiments yield only the product of the bimolecular rate constant and the lifetime of the R* reactant atom (krτu), and the values of this product obtained at EV=15, 20, and 22 v are for argon, neon, and helium 3.6×10—16, 11.6×10—16, and 0.58×10—16 cc/molecule. At EV=70 v values of 2.7×10—16 and 1.1×10—16 cc molecule are obtained for argon and neon. Speculations are given concerning the magnitude of the lifetimes of R*, and it is concluded that values of about 10—8 sec must be considered as possible. The corresponding cross sections for the reaction forming R2+ lie in the range 1000–10 000×10—16 cm2.The rate constants for the formation of Ar2+ and Ne2+ by the three‐body process are, respectively, 2.1×10—28 and 2.0×10—29 cc2/molecule2sec. It is recognized that values as large as these are in disagreement with values inferred from pulsed‐discharge ion‐drift velocity experiments. A possible mode of reconciliation is suggested; namely, at sufficiently high pressures collisional decomposition of R2+ ions formed by the termolecular process occur in the drift‐velocity experiments." @default.
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• W2091663174 date "1962-06-15" @default.
• W2091663174 modified "2023-10-16" @default.
• W2091663174 title "Rare‐Gas Molecule‐Ion Formation by Mass Spectrometry. Kinetics of Ar₂⁺, Ne₂⁺, and He₂⁺Formation by Second‐ and Third‐Order Processes" @default.
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• W2091663174 doi "https://doi.org/10.1063/1.1732466" @default.
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