Charge transfer reactions between D+, O+, Ar+, Kr+ and Xe+ with CH4, C2H6 and C3H8 at relative energies 1–10 eV

Gale, Peggy; Paulson, John F.; Henchman, Michael

doi:10.1016/0168-1176(95)04278-s

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…15 In some cases, the details of the distribution of electronic, vibrational and rotational energy of reactants and products may be more important than the occurrence of resonances. Qualitative predictions of relative rates of reaction can be made using less than fully ab initio methods (Franck-Condon factors and transition probabilities have been correlated with reaction propensities 32 ). Our interest is in the analytical utility of certain ion/molecule reactions and the measurement of relative reaction rates, although in the present work rates are not measured, only extents of reaction.…”

Section: Resultsmentioning

confidence: 99%

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Eiden

Barinaga

Koppenaal

1997

Rapid Commun. Mass Spectrom.

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A plasma source ion trap (PSIT) mass spectrometer has been modified to incorporate a radiofrequency octopole ion guide/collision cell between the ion source and the mass spectrometer. This modification allows ions sampled from the plasma to undergo reactions prior to mass spectrometric analysis. This capability can obviate the need for chemical or chromatographic separation of the sample, remove mass spectral intereferences and enable formation of analytically useful molecular ions. Distinct reaction chemistries can be utilized in the octopole and/or ion trap. Performance of the instrument is dramatically improved if hydrogen gas is introduced into the octopole; molecular hydrogen reacts with Ar + and certain other plasma ions, greatly reduces their intensities, and cools and focuses the ion beam prior to its injection into the ion trap.

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Section: Resultsmentioning

confidence: 99%

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Eiden

Barinaga

Koppenaal

1997

Rapid Commun. Mass Spectrom.

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“…DLC films are interesting for numerous industrial and biomedical applications . In some cases, a combination with RF discharge is used for DLC film fabrication . However, ECR microwave plasma deposition has finally asserted itself as the most efficient method.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, we should expect their appearance also in acetylene/argon ECR discharge. Understanding the kinetics of the processes (such as formation of ions, radicals, and their mixtures) taking place in the discharge is important to efficiently tune film properties. Creation of various radicals and ions appears to be the key mechanism in the formation of hard carbonaceous films.…”

Section: Introductionmentioning

confidence: 99%

Creation and behavior of radicals and ions in the Acetylene/Argon microwave ECR discharge

Pokorný

Musil

Novotný

et al. 2017

Plasma Processes & Polymers

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Formation and number of molecules, radicals, and ions in ECR acetylene/argon discharge is studied as functions of gas flow rate, supplied power, and partial pressure of acetylene. The spectra obtained by neutral mass spectrometry (NMS) exhibit the presence of atomic hydrogen and H2 molecules. The quantity of acetylene ions is rather high in the range of power up to 350 W, but it drops down with increasing power. At higher powers, the change to C2H+ ion takes place and its quantity grows with increasing power. The dependence of the number of C2+, C2H+, C2H2+ on the electron energy is judged by appearance potential mass spectrometry in the energy range 0–100 eV. The obtained findings are useful for the technology of industrial preparation of DLC thin films.

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“…31 The importance to consider the reactions with methane stems from the multiple other possible oxygen bearing products, such as H x O (+) (with x = 1-3) or H y CO (+) (with y = 0-3), which could initiate a very different chemistry. Many product reaction channels among the (O1-O10) processes listed below have been identified and discussed in experimental [33][34][35][36][37][38] and theoretical [38][39][40] studies of the reaction of atomic oxygen ions with methane: The energetics in equation (O1-O10) are given for ground-state reactants and products and for the most abundant isotopes, 16 O and 12 CH 4 . These channels are displayed in Figure 1 together with channels, which will be discussed later, where reactants or products are in electronically excited states.…”

Section: Introductionmentioning

confidence: 99%

Reactions of State-Selected Atomic Oxygen Ions O⁺(⁴S, ²D, ²P) with Methane

et al. 2015

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An experimental study has been carried out on the reactions of state selected O(+)((4)S, (2)D, (2)P) ions with methane with the aims of characterizing the effects of both the parent ion internal energy and collision energy on the reaction dynamics and determining the fate of oxygen species in complex media, in particular the Titan ionosphere. Absolute cross sections and product velocity distributions have been determined for the reactions of (16)O(+) or (18)O(+) ions with CH4 or CD4 from thermal to 5 eV collision energies by using the guided ion beam (GIB) technique. Dissociative photoionization of O2 with vacuum ultraviolet (VUV) synchrotron radiation delivered by the DESIRS beamline at the SOLEIL storage ring and the threshold photoion photoelectron coincidence (TPEPICO) technique are used for the preparation of purely state-selected O(+)((4)S, (2)D, (2)P) ions. A complete inversion of the product branching ratio between CH4(+) and CH3(+) ions in favor of the latter is observed for excitation of O(+) ions from the (4)S ground state to either the (2)D or the (2)P metastable state. CH4(+) and CH3(+) ions, which are by far the major products for the reaction of ground state and excited states, are strongly backward scattered in the center of mass frame relative to O(+) parent ions. For the reaction of O(+)((4)S), CH3(+) production also rises with increasing collision energy but with much less efficiency than with O(+) excitation. We found that a mechanism of dissociative charge transfer, mediated by an initial charge transfer step, can account very well for all the observations, indicating that CH3(+) production is associated with the formation of H and O atoms (CH3(+) + H + O) rather than with OH formation by an hydride transfer process (CH3(+) + OH). Therefore, as the CH4(+) production by charge transfer is also associated with O atoms, the fate of oxygen species in these reactions is essentially the O production, except for the reaction of O(+)((4)S), which also produces appreciable amounts of H2O(+) ions but only at very low collision energy. The production of O atoms and the nature of the states in which they are formed are discussed for the reactions of O(+) ions with CH4 and N2.

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Charge transfer reactions between D+, O+, Ar+, Kr+ and Xe+ with CH4, C2H6 and C3H8 at relative energies 1–10 eV

Cited by 10 publications

References 14 publications

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Creation and behavior of radicals and ions in the Acetylene/Argon microwave ECR discharge

Reactions of State-Selected Atomic Oxygen Ions O⁺(⁴S, ²D, ²P) with Methane

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Charge transfer reactions between D+, O+, Ar+, Kr+ and Xe+ with CH4, C2H6 and C3H8 at relative energies 1–10 eV

Cited by 10 publications

References 14 publications

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Creation and behavior of radicals and ions in the Acetylene/Argon microwave ECR discharge

Reactions of State-Selected Atomic Oxygen Ions O+(4S, 2D, 2P) with Methane

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Reactions of State-Selected Atomic Oxygen Ions O⁺(⁴S, ²D, ²P) with Methane