Bimolecular reactions of ions trapped in an electron space charge
01 Aug 1970-International Journal of Mass Spectrometry and Ion Physics (Elsevier)-Vol. 4, Iss: 5, pp 415-431
TL;DR: The use of ion-trapping techniques in conventional magnetic deflection mass spectrometers for the study of ionmolecule reactions has been investigated in this paper, and the results indicate that the reactant ions have kinetic energies in the range 0.3 to 0.5 eV.
About: This article is published in International Journal of Mass Spectrometry and Ion Physics.The article was published on 1970-08-01. It has received 73 citations till now. The article focuses on the topics: Ion.
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120 citations
TL;DR: In this paper, the effects of collision energy and mode-selective vibrational excitation on the reaction of C2H+2 with CH4 and CD4 have been measured, along with the corresponding product velocity distributions.
Abstract: The effects of collision energy and mode‐selective vibrational excitation on the reaction of C2H+2 with CH4 and CD4 have been measured, along with the corresponding product velocity distributions. Two distinct reaction mechanisms are active in the energy range below 5 eV. At low energies, a long‐lived C3H+6 complex forms efficiently, then decomposes primarily to C3H+5+H and C3H+4+H2. The RRKM lifetime of this complex is estimated to range between ∼10 ns and ∼10 ps over the experimental energy range, and this is sufficient time to allow substantial H‐atom scrambling. Complex formation is strongly inhibited by collision energy, weakly inhibited by CC stretching, and enhanced by bending excitation. Competing with the complex‐mediated mechanism is a direct H‐atom abstraction reaction, producing C2H+3+CH3 with little atom scrambling. This reaction is shown to have a ∼150 meV activation barrier and is strongly enhanced by collision energy, becoming the dominant channel above 0.4 eV. CC stretching provides a wea...
70 citations
TL;DR: In this article, the authors presented twenty four new ion-molecule reactions for inclusion in the modeling of the ionosphere of Saturn's satellite Titan, which are consistent with the expected increase in ion size through ion molecule reaction processing.
58 citations
TL;DR: In this article, Bimolecular reactions which occur in weakly ionized mixtures of (H2 + He), (H 2 + Ne),(H2+ Ne), (h2 + Ar), and (H + Kr) have been studied while the ions are contained in the space charge trap generated by the passage of a low energy electron beam through the ion source of a mass spectrometer.
Abstract: Bimolecular reactions which occur in weakly ionized mixtures of (H2 + He), (H2 + Ne), (H2 + Ar), and (H2 + Kr) have been studied while the ions are contained in the space charge trap generated by the passage of a low energy electron beam through the ion source of a mass spectrometer. For the mixtures (H2 + He) and (H2 + Ne) the results observed for the primary ions are in agreement with the results of earlier studies. However the hydride ions, produced by reaction of H2+ with He or Ne, have been found to react with rate coefficients which are about 50 times higher than those reported previously. In (H2 + Ar) and (H2 + Kr) mixtures the H2+ ions have been found to react with rate coefficients which are in good agreement with the polarization theory. Ar+ ions on collision with H2 react with only about half the predicted value, and approximately one reactive collision in four leads to the formation of H2+. Both the 2P(3/2) and the 2P(1/2) states of Kr+ appear to react with a rate coefficient which is only 10%...
56 citations
TL;DR: In this paper, a 13.56 MHz discharge in methane has been monitored at pressures from 0.1 to 1 torr at flow rates which allow a relatively long residence time in the discharge chamber.
52 citations
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TL;DR: In this paper, the rate constants for formation of the protonated molecule by ion-molecule reactions in CH3OH, (CH3)2O, and CH4 have been studied both at thermal energies and at 3.4 eV ion exit energy with a new...
Abstract: The rate constants for formation of the protonated molecule by ion–molecule reactions in CH3OH, (CH3)2O, and CH4 have been studied both at thermal energies and at 3.4 eV ion exit energy with a new ...
187 citations
133 citations
TL;DR: In this paper, single-and multiple-resonance spectroscopy was used to identify and examine the energetics of ion-molecule reactions in which H3O+ and H3S+ are involved either as product or reactant.
Abstract: Ion cyclotron single‐ and multiple‐resonance spectroscopy have been used to identify and examine the energetics of ion‐molecule reactions in which H3O+ and H3S+ are involved either as product or reactant. The reactions observed provide narrow limits for the gas‐phase proton affinities of these species, giving 164 ± 4 kcal/mole for H2O and 178 ± 2 kcal/mole for H2S.
94 citations
85 citations
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