Mass-Spectrometric Observations of Negative Ions in Flame Gases

Knewstubb, P. F.; Sugden, T. M.

doi:10.1038/1961311a0

Cited by 23 publications

(12 citation statements)

References 2 publications

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“…25. While the O Ϫ ϩH 2 O reaction has been studied by several groups 44 -49 and O Ϫ ͑H 2 O͒ has been observed by mass spectrometry in H 2 /O 2 /N 2 flames, 50 no experimental characterization of the O Ϫ ͑H 2 O͒ anion has been completed which can confirm the results of the ab initio calculations to be presented in Sec. III B.…”

Section: Introductionmentioning

confidence: 96%

Spectroscopy of the transition state: Elementary reactions of the hydroxyl radical studied by photoelectron spectroscopy of O−(H2O) and H3O−2

Arnold

Neumark

1995

The Journal of Chemical Physics

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The transition state regions of the OHϩOH→O͑ 3 P͒ϩH 2 O and the OHϩH 2 O→H 2 OϩOH reactions are studied by photoelectron spectroscopy of the O Ϫ ͑H 2 O͒ and H 3 O 2 Ϫ anions and their deuterated analogs. The spectra show resolved vibrational progressions attributed to H-atom vibrational motion in the unstable neutral complexes formed by photodetachment. The positions and intensities of the peaks change markedly upon isotopic substitution. One-dimensional Franck-Condon calculations using ab initio potentials for the anion and neutral are used to interpret the peak spacings and intensities, as well as the strong isotopic effects. The results are discussed in the context of previously obtained transition state spectra for heavyϩlight-heavy reactions.

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Section: Introductionmentioning

confidence: 96%

Spectroscopy of the transition state: Elementary reactions of the hydroxyl radical studied by photoelectron spectroscopy of O−(H2O) and H3O−2

Arnold

Neumark

1995

The Journal of Chemical Physics

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“…At the same time, it has been shown that in a hydrogen-rich H 2 -O 2 -N 2 flame, a low degree of natural ionization is observed in very pure gases that do not contain impurities such as hydrocarbons and alkali metal compounds [41][42][43][45][46][47][48]. When pure hydrogen is used as the carrier gas in a gas chromatograph with a column and an ionization detector with a burner, the degree of ionization of the carrier gas is very low [3].…”

Section: Introductionmentioning

confidence: 99%

“…contained in combustible gas mixtures have an especially strong effect on the ionization of hydrogen-oxygen flames in which the natural ionization process is ineffective [15,[41][42][43][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

“…There are results of massspectrometric measurements of the absolute degree of ionization (ion concentration) in hydrogen-rich flames obtained by [3,[41][42][43][45][46][47][48] and data on the ion concentrations in flames of both rich and lean mixtures measured using electrical probes [3,13]. Results from probe measurements of the degree of ionization in combustion of a 2H 2 + O 2 + 6N 2 + 0.005CH 4 stoichiometric mixture are given in [17].…”

Section: Introductionmentioning

confidence: 99%

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Chain-thermal explosion and degree of ionization of hydrogen-air flames

Proskudin

Berezhko

Belyaev

et al. 2005

Combust Explos Shock Waves

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“…Hydrated neutral and ionic clusters are known to be important participants in the chemistry of the atmosphere [1][2][3][4] and are also present in combustion processes. 5 Specifically, reactions of O Ϫ and OH Ϫ and the corresponding neutral species O and OH with a single water molecule have received considerable attention in the literature due to their importance in combustion and atmospheric models. [6][7][8][9][10] The small size of these clusters also makes them amenable to high-level theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

Dissociative photodetachment studies of O−(H2O)2, OH−(H2O)2, and the deuterated isotopomers: Energetics and three-body dissociation dynamics

Clements¹,

Luong²,

Deyerl³

et al. 2001

The Journal of Chemical Physics

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Photoelectron-photofragment coincidence spectroscopy was used to study dissociative photodetachment of the doubly hydrated clusters of oxide and hydroxide, M Ϫ ͑H 2 O͒ 2 →Mϩ2H 2 O ϩe Ϫ ͑MϭO, OH͒. These experiments yield information on the energetics of the parent anion and the dissociation dynamics of the photodetached neutral species. Photoelectron spectra and photoelectron-photofragment coincidence spectra are presented and compared to data for O Ϫ ͑H 2 O) and OH Ϫ ͑H 2 O). Unlike the singly hydrated species, no evidence of vibrationally resolved product translational energy distributions is observed. The second hydration energy of O Ϫ with both H 2 O and D 2 O was also measured to be 0.80Ϯ0.08 and 0.81Ϯ0.08 eV, respectively. The three-body dissociation dynamics of the neutral clusters produced by photodetachment were studied by measuring the velocities and recoil angles of all the particles in coincidence. The observed partitioning of momentum is consistent with a two-step mechanism or dissociation from a wide range of starting geometries.

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Mass-Spectrometric Observations of Negative Ions in Flame Gases

Cited by 23 publications

References 2 publications

Spectroscopy of the transition state: Elementary reactions of the hydroxyl radical studied by photoelectron spectroscopy of O−(H2O) and H3O−2

Spectroscopy of the transition state: Elementary reactions of the hydroxyl radical studied by photoelectron spectroscopy of O−(H2O) and H3O−2

Chain-thermal explosion and degree of ionization of hydrogen-air flames

Dissociative photodetachment studies of O−(H2O)2, OH−(H2O)2, and the deuterated isotopomers: Energetics and three-body dissociation dynamics

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